Add language identifiers for more code blocks

These pages in the API section were missing language declarations
in their code blocks.

doc/api/README.md

@@ -260,7 +260,7 @@ returned with status code `404`:
 Example of a valid API call and a request using cURL with sudo request,
 providing a username:
 
-```
+```plaintext
 GET /projects?private_token=<your_access_token>&sudo=username
 ```
 
@@ -271,7 +271,7 @@ curl --header "Private-Token: <your_access_token>" --header "Sudo: username" "ht
 Example of a valid API call and a request using cURL with sudo request,
 providing an ID:
 
-```
+```plaintext
 GET /projects?private_token=<your_access_token>&sudo=23
 ```
 
@@ -444,7 +444,7 @@ URL-encoded.
 
 For example, `/` is represented by `%2F`:
 
-```
+```plaintext
 GET /api/v4/projects/diaspora%2Fdiaspora
 ```
 
@@ -460,7 +460,7 @@ URL-encoded.
 
 For example, `/` is represented by `%2F`:
 
-```
+```plaintext
 GET /api/v4/projects/1/branches/my%2Fbranch/commits
 ```
 
@@ -604,13 +604,13 @@ to a [W3 recommendation](http://www.w3.org/Addressing/URL/4_URI_Recommentations.
 causes a `+` to be interpreted as a space. For example, in an ISO 8601 date, you may want to pass
 a time in Mountain Standard Time, such as:
 
-```
+```plaintext
 2017-10-17T23:11:13.000+05:30
 ```
 
 The correct encoding for the query parameter would be:
 
-```
+```plaintext
 2017-10-17T23:11:13.000%2B05:30
 ```
 

doc/api/project_clusters.md

@@ -9,7 +9,7 @@ User will need at least maintainer access to use these endpoints.
 
 Returns a list of project clusters.
 
-```
+```plaintext
 GET /projects/:id/clusters
 ```
 
@@ -368,7 +368,7 @@ Example response:
 
 Deletes an existing project cluster.
 
-```
+```plaintext
 DELETE /projects/:id/clusters/:cluster_id
 ```
 

doc/api/project_level_variables.md

@@ -4,7 +4,7 @@
 
 Get list of a project's variables.
 
-```
+```plaintext
 GET /projects/:id/variables
 ```
 
@@ -12,7 +12,7 @@ GET /projects/:id/variables
 |-----------|---------|----------|---------------------|
 | `id`      | integer/string | yes      | The ID of a project or [urlencoded NAMESPACE/PROJECT_NAME of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
 
-```
+```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/variables"
 ```
 
@@ -35,7 +35,7 @@ curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/a
 
 Get the details of a project's specific variable.
 
-```
+```plaintext
 GET /projects/:id/variables/:key
 ```
 
@@ -44,7 +44,7 @@ GET /projects/:id/variables/:key
 | `id`      | integer/string | yes      | The ID of a project or [urlencoded NAMESPACE/PROJECT_NAME of the project](README.md#namespaced-path-encoding) owned by the authenticated user   |
 | `key`     | string  | yes      | The `key` of a variable |
 
-```
+```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/variables/TEST_VARIABLE_1"
 ```
 
@@ -62,7 +62,7 @@ curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/a
 
 Create a new variable.
 
-```
+```plaintext
 POST /projects/:id/variables
 ```
 
@@ -76,7 +76,7 @@ POST /projects/:id/variables
 | `masked`            | boolean | no       | Whether the variable is masked |
 | `environment_scope` | string  | no       | The `environment_scope` of the variable |
 
-```
+```shell
 curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/variables" --form "key=NEW_VARIABLE" --form "value=new value"
 ```
 
@@ -95,7 +95,7 @@ curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" "https://gitla
 
 Update a project's variable.
 
-```
+```plaintext
 PUT /projects/:id/variables/:key
 ```
 
@@ -109,7 +109,7 @@ PUT /projects/:id/variables/:key
 | `masked`            | boolean | no       | Whether the variable is masked |
 | `environment_scope` | string  | no       | The `environment_scope` of the variable |
 
-```
+```shell
 curl --request PUT --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/variables/NEW_VARIABLE" --form "value=updated value"
 ```
 
@@ -128,7 +128,7 @@ curl --request PUT --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab
 
 Remove a project's variable.
 
-```
+```plaintext
 DELETE /projects/:id/variables/:key
 ```
 
@@ -137,6 +137,6 @@ DELETE /projects/:id/variables/:key
 | `id`      | integer/string | yes      | The ID of a project or [urlencoded NAMESPACE/PROJECT_NAME of the project](README.md#namespaced-path-encoding) owned by the authenticated user     |
 | `key`     | string  | yes      | The `key` of a variable |
 
-```
+```shell
 curl --request DELETE --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/variables/VARIABLE_1"
 ```

doc/api/project_snippets.md

@@ -23,7 +23,7 @@ visibility setting keep this setting. You can read more about the change in the
 
 Get a list of project snippets.
 
-```
+```plaintext
 GET /projects/:id/snippets
 ```
 
@@ -35,7 +35,7 @@ Parameters:
 
 Get a single project snippet.
 
-```
+```plaintext
 GET /projects/:id/snippets/:snippet_id
 ```
 
@@ -68,7 +68,7 @@ Parameters:
 
 Creates a new project snippet. The user must have permission to create new snippets.
 
-```
+```plaintext
 POST /projects/:id/snippets
 ```
 
@@ -106,7 +106,7 @@ curl --request POST https://gitlab.com/api/v4/projects/:id/snippets \
 
 Updates an existing project snippet. The user must have permission to change an existing snippet.
 
-```
+```plaintext
 PUT /projects/:id/snippets/:snippet_id
 ```
 
@@ -145,7 +145,7 @@ curl --request PUT https://gitlab.com/api/v4/projects/:id/snippets/:snippet_id \
 
 Deletes an existing project snippet. This returns a `204 No Content` status code if the operation was successfully or `404` if the resource was not found.
 
-```
+```plaintext
 DELETE /projects/:id/snippets/:snippet_id
 ```
 
@@ -165,7 +165,7 @@ curl --request DELETE https://gitlab.com/api/v4/projects/:id/snippets/:snippet_i
 
 Returns the raw project snippet as plain text.
 
-```
+```plaintext
 GET /projects/:id/snippets/:snippet_id/raw
 ```
 
@@ -187,7 +187,7 @@ curl https://gitlab.com/api/v4/projects/:id/snippets/:snippet_id/raw \
 
 Available only for admins.
 
-```
+```plaintext
 GET /projects/:id/snippets/:snippet_id/user_agent_detail
 ```
 

doc/api/project_statistics.md

@@ -8,7 +8,7 @@ Retrieving the statistics requires write access to the repository.
 Currently only HTTP fetches statistics are returned.
 Fetches statistics includes both clones and pulls count and are HTTP only, SSH fetches are not included.
 
-```
+```plaintext
 GET /projects/:id/statistics
 ```
 

doc/api/project_templates.md

@@ -21,7 +21,7 @@ in GitLab 11.5
 
 ## Get all templates of a particular type
 
-```
+```plaintext
 GET /projects/:id/templates/:type
 ```
 
@@ -87,7 +87,7 @@ Example response (licenses):
 
 ## Get one template of a particular type
 
-```
+```plaintext
 GET /projects/:id/templates/:type/:key
 ```
 
@@ -106,7 +106,6 @@ Example response (Dockerfile):
   "name": "Binary",
   "content": "# This file is a template, and might need editing before it works on your project.\n# This Dockerfile installs a compiled binary into a bare system.\n# You must either commit your compiled binary into source control (not recommended)\n# or build the binary first as part of a CI/CD pipeline.\n\nFROM buildpack-deps:jessie\n\nWORKDIR /usr/local/bin\n\n# Change `app` to whatever your binary is called\nAdd app .\nCMD [\"./app\"]\n"
 }
-
 ```
 
 Example response (license):

doc/api/projects.md

@@ -35,7 +35,7 @@ There are currently three options for `merge_method` to choose from:
 Get a list of all visible projects across GitLab for the authenticated user.
 When accessed without authentication, only public projects with "simple" fields are returned.
 
-```
+```plaintext
 GET /projects
 ```
 
@@ -298,7 +298,7 @@ the `approvals_before_merge` parameter:
 
 You can filter by [custom attributes](custom_attributes.md) with:
 
-```
+```plaintext
 GET /projects?custom_attributes[key]=value&custom_attributes[other_key]=other_value
 ```
 
@@ -315,7 +315,7 @@ Note that keyset pagination only supports `order_by=id`. Other sorting options a
 
 Get a list of visible projects owned by the given user. When accessed without authentication, only public projects are returned.
 
-```
+```plaintext
 GET /users/:user_id/projects
 ```
 
@@ -530,7 +530,7 @@ This endpoint supports [keyset pagination](README.md#keyset-based-pagination) fo
 
 Get a list of visible projects owned by the given user. When accessed without authentication, only public projects are returned.
 
-```
+```plaintext
 GET /users/:user_id/starred_projects
 ```
 
@@ -740,7 +740,7 @@ Example response:
 Get a specific project. This endpoint can be accessed without authentication if
 the project is publicly accessible.
 
-```
+```plaintext
 GET /projects/:id
 ```
 
@@ -955,7 +955,7 @@ If the project is a fork, and you provide a valid token to authenticate, the
 
 Get the users list of a project.
 
-```
+```plaintext
 GET /projects/:id/users
 ```
 
@@ -993,7 +993,7 @@ Please refer to the [Events API documentation](events.md#list-a-projects-visible
 
 Creates a new project owned by the authenticated user.
 
-```
+```plaintext
 POST /projects
 ```
 
@@ -1061,7 +1061,7 @@ where `password` is a public access key with the `api` scope enabled.
 
 Creates a new project owned by the specified user. Available only for admins.
 
-```
+```plaintext
 POST /projects/user/:user_id
 ```
 
@@ -1128,7 +1128,7 @@ where `password` is a public access key with the `api` scope enabled.
 
 Updates an existing project.
 
-```
+```plaintext
 PUT /projects/:id
 ```
 
@@ -1200,7 +1200,7 @@ The forking operation for a project is asynchronous and is completed in a
 background job. The request will return immediately. To determine whether the
 fork of the project has completed, query the `import_status` for the new project.
 
-```
+```plaintext
 POST /projects/:id/fork
 ```
 
@@ -1217,7 +1217,7 @@ POST /projects/:id/fork
 
 List the projects accessible to the calling user that have an established, forked relationship with the specified project
 
-```
+```plaintext
 GET /projects/:id/forks
 ```
 
@@ -1315,7 +1315,7 @@ Example responses:
 
 Stars a given project. Returns status code `304` if the project is already starred.
 
-```
+```plaintext
 POST /projects/:id/star
 ```
 
@@ -1405,7 +1405,7 @@ Example response:
 
 Unstars a given project. Returns status code `304` if the project is not starred.
 
-```
+```plaintext
 POST /projects/:id/unstar
 ```
 
@@ -1495,7 +1495,7 @@ Example response:
 
 List the users who starred the specified project.
 
-```
+```plaintext
 GET /projects/:id/starrers
 ```
 
@@ -1540,7 +1540,7 @@ Example responses:
 
 Get languages used in a project with percentage value.
 
-```
+```plaintext
 GET /projects/:id/languages
 ```
 
@@ -1564,7 +1564,7 @@ Example response:
 Archives the project if the user is either admin or the project owner of this project. This action is
 idempotent, thus archiving an already archived project will not change the project.
 
-```
+```plaintext
 POST /projects/:id/archive
 ```
 
@@ -1673,7 +1673,7 @@ Example response:
 Unarchives the project if the user is either admin or the project owner of this project. This action is
 idempotent, thus unarchiving a non-archived project will not change the project.
 
-```
+```plaintext
 POST /projects/:id/unarchive
 ```
 
@@ -1786,7 +1786,7 @@ This endpoint either:
   deletion happens after number of days specified in
   [instance settings](../user/admin_area/settings/visibility_and_access_controls.md#default-deletion-adjourned-period-premium-only).
 
-```
+```plaintext
 DELETE /projects/:id
 ```
 
@@ -1800,7 +1800,7 @@ DELETE /projects/:id
 
 Restores project marked for deletion.
 
-```
+```plaintext
 POST /projects/:id/restore
 ```
 
@@ -1812,7 +1812,7 @@ POST /projects/:id/restore
 
 Uploads a file to the specified project to be used in an issue or merge request description, or a comment.
 
-```
+```plaintext
 POST /projects/:id/uploads
 ```
 
@@ -1848,7 +1848,7 @@ In Markdown contexts, the link is automatically expanded when the format in
 
 Allow to share project with group.
 
-```
+```plaintext
 POST /projects/:id/share
 ```
 
@@ -1863,7 +1863,7 @@ POST /projects/:id/share
 
 Unshare the project from the group. Returns `204` and no content on success.
 
-```
+```plaintext
 DELETE /projects/:id/share/:group_id
 ```
 
@@ -1885,7 +1885,7 @@ These are different for [System Hooks](system_hooks.md) that are system wide.
 
 Get a list of project hooks.
 
-```
+```plaintext
 GET /projects/:id/hooks
 ```
 
@@ -1897,7 +1897,7 @@ GET /projects/:id/hooks
 
 Get a specific hook for a project.
 
-```
+```plaintext
 GET /projects/:id/hooks/:hook_id
 ```
 
@@ -1930,7 +1930,7 @@ GET /projects/:id/hooks/:hook_id
 
 Adds a hook to a specified project.
 
-```
+```plaintext
 POST /projects/:id/hooks
 ```
 
@@ -1955,7 +1955,7 @@ POST /projects/:id/hooks
 
 Edits a hook for a specified project.
 
-```
+```plaintext
 PUT /projects/:id/hooks/:hook_id
 ```
 
@@ -1982,7 +1982,7 @@ PUT /projects/:id/hooks/:hook_id
 Removes a hook from a project. This is an idempotent method and can be called multiple times.
 Either the hook is available or not.
 
-```
+```plaintext
 DELETE /projects/:id/hooks/:hook_id
 ```
 
@@ -2000,7 +2000,7 @@ Allows modification of the forked relationship between existing projects. Availa
 
 ### Create a forked from/to relation between existing projects
 
-```
+```plaintext
 POST /projects/:id/fork/:forked_from_id
 ```
 
@@ -2011,7 +2011,7 @@ POST /projects/:id/fork/:forked_from_id
 
 ### Delete an existing forked from relationship
 
-```
+```plaintext
 DELETE /projects/:id/fork
 ```
 
@@ -2025,7 +2025,7 @@ Search for projects by name which are accessible to the authenticated user. This
 endpoint can be accessed without authentication if the project is publicly
 accessible.
 
-```
+```plaintext
 GET /projects
 ```
 
@@ -2043,7 +2043,7 @@ curl --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/ap
 
 > Introduced in GitLab 9.0.
 
-```
+```plaintext
 POST /projects/:id/housekeeping
 ```
 
@@ -2057,7 +2057,7 @@ POST /projects/:id/housekeeping
 
 Get the push rules of a project.
 
-```
+```plaintext
 GET /projects/:id/push_rule
 ```
 
@@ -2101,7 +2101,7 @@ the `commit_committer_check` and `reject_unsigned_commits` parameters:
 
 Adds a push rule to a specified project.
 
-```
+```plaintext
 POST /projects/:id/push_rule
 ```
 
@@ -2124,7 +2124,7 @@ POST /projects/:id/push_rule
 
 Edits a push rule for a specified project.
 
-```
+```plaintext
 PUT /projects/:id/push_rule
 ```
 
@@ -2150,7 +2150,7 @@ PUT /projects/:id/push_rule
 Removes a push rule from a project. This is an idempotent method and can be called multiple times.
 Either the push rule is available or not.
 
-```
+```plaintext
 DELETE /projects/:id/push_rule
 ```
 
@@ -2162,7 +2162,7 @@ DELETE /projects/:id/push_rule
 
 > Introduced in GitLab 11.1.
 
-```
+```plaintext
 PUT /projects/:id/transfer
 ```
 
@@ -2186,7 +2186,7 @@ Read more in the [Project members](members.md) documentation.
 
 > Introduced in [GitLab Starter](https://about.gitlab.com/pricing/) 10.3.
 
-```
+```plaintext
 POST /projects/:id/mirror/pull
 ```
 
@@ -2219,7 +2219,7 @@ format.
 If a repository is corrupted to the point where `git clone` does not work, the
 snapshot may allow some of the data to be retrieved.
 
-```
+```plaintext
 GET /projects/:id/snapshot
 ```
 

doc/api/protected_branches.md

@@ -6,7 +6,7 @@
 
 The access levels are defined in the `ProtectedRefAccess.allowed_access_levels` method. Currently, these levels are recognized:
 
-```
+```plaintext
 0  => No access
 30 => Developer access
 40 => Maintainer access
@@ -17,7 +17,7 @@ The access levels are defined in the `ProtectedRefAccess.allowed_access_levels`
 
 Gets a list of protected branches from a project.
 
-```
+```plaintext
 GET /projects/:id/protected_branches
 ```
 
@@ -91,7 +91,7 @@ Example response:
 
 Gets a single protected branch or wildcard protected branch.
 
-```
+```plaintext
 GET /projects/:id/protected_branches/:name
 ```
 
@@ -160,7 +160,7 @@ Example response:
 Protects a single repository branch or several project repository
 branches using a wildcard protected branch.
 
-```
+```plaintext
 POST /projects/:id/protected_branches
 ```
 
@@ -292,7 +292,7 @@ Example response:
 
 Unprotects the given protected branch or wildcard protected branch.
 
-```
+```plaintext
 DELETE /projects/:id/protected_branches/:name
 ```
 
@@ -309,7 +309,7 @@ curl --request DELETE --header "PRIVATE-TOKEN: <your_access_token>" 'https://git
 
 Update the "code owner approval required" option for the given protected branch protected branch.
 
-```
+```plaintext
 PATCH /projects/:id/protected_branches/:name
 ```
 

doc/api/protected_environments.md

@@ -7,7 +7,7 @@
 The access levels are defined in the `ProtectedEnvironment::DeployAccessLevel::ALLOWED_ACCESS_LEVELS` method.
 Currently, these levels are recognized:
 
-```
+```plaintext
 30 => Developer access
 40 => Maintainer access
 60 => Admin access

doc/api/protected_tags.md

@@ -6,7 +6,7 @@
 
 Currently, these levels are recognized:
 
-```
+```plaintext
 0  => No access
 30 => Developer access
 40 => Maintainer access
@@ -17,7 +17,7 @@ Currently, these levels are recognized:
 Gets a list of protected tags from a project.
 This function takes pagination parameters `page` and `per_page` to restrict the list of protected tags.
 
-```
+```plaintext
 GET /projects/:id/protected_tags
 ```
 
@@ -51,7 +51,7 @@ Example response:
 Gets a single protected tag or wildcard protected tag.
 The pagination parameters `page` and `per_page` can be used to restrict the list of protected tags.
 
-```
+```plaintext
 GET /projects/:id/protected_tags/:name
 ```
 
@@ -83,7 +83,7 @@ Example response:
 Protects a single repository tag or several project repository
 tags using a wildcard protected tag.
 
-```
+```plaintext
 POST /projects/:id/protected_tags
 ```
 
@@ -115,7 +115,7 @@ Example response:
 
 Unprotects the given protected tag or wildcard protected tag.
 
-```
+```plaintext
 DELETE /projects/:id/protected_tags/:name
 ```