Add missing scopes to the personal access tokens API docs

doc/api/users.md

@@ -1850,7 +1850,7 @@ POST /users/:user_id/personal_access_tokens
 | `user_id`    | integer | yes      | The ID of the user                                                                                                       |
 | `name`       | string  | yes      | The name of the personal access token                                                                                    |
 | `expires_at` | date    | no       | The expiration date of the personal access token in ISO format (`YYYY-MM-DD`)                                            |
-| `scopes`     | array   | yes      | The array of scopes of the personal access token (`api`, `read_user`, `read_api`, `read_repository`, `write_repository`) |
+| `scopes`     | array   | yes      | The array of scopes of the personal access token. See [personal access token scopes](../user/profile/personal_access_tokens.md#personal-access-token-scopes) for possible values. |
 
 ```shell
 curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" --data "name=mytoken" --data "expires_at=2017-04-04" \

doc/user/profile/personal_access_tokens.md

@@ -98,8 +98,8 @@ A personal access token can perform actions based on the assigned scopes.
 | `read_api`         | Read-only for the complete API, including all groups and projects, the Container Registry, and the Package Registry. ([Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28944) in GitLab 12.10.) |
 | `read_repository`  | Read-only (pull) for the repository through `git clone`. |
 | `write_repository` | Read-write (pull, push) for the repository through `git clone`. |
-| `read_registry`    | Read-only (pull) for [Container Registry](../packages/container_registry/index.md) images if a project is private and authorization is required. |
-| `write_registry`   | Read-write (push) for [Container Registry](../packages/container_registry/index.md) images if a project is private and authorization is required. ([Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28958) in GitLab 12.10.) |
+| `read_registry`    | Read-only (pull) for [Container Registry](../packages/container_registry/index.md) images if a project is private and authorization is required. Available only when the Container Registry is enabled. |
+| `write_registry`   | Read-write (push) for [Container Registry](../packages/container_registry/index.md) images if a project is private and authorization is required. Available only when the Container Registry is enabled. ([Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28958) in GitLab 12.10.) |
 | `sudo`             | API actions as any user in the system (if the authenticated user is an administrator). |
 
 ## When personal access tokens expire