Add vale rule for "admin" abbreviation

doc/.vale/gitlab/AdminArea.yml

+---
+# Warning: gitlab.AdminArea
+#
+# You should not use "admin", but "Admin Area" is OK.
+#
+# For a list of all options, see https://errata-ai.gitbook.io/vale/getting-started/styles
+extends: substitution
+message: 'Use "administration", "administrator", "administer", or "Admin Area" instead of "admin" or "admin area".'
+link: https://docs.gitlab.com/ee/development/documentation/styleguide.html
+level: warning
+ignorecase: true
+swap:
+  'admin ?\w*': '(?:Admin Area|[Aa]dministrat(ion|or|e))'

doc/user/project/settings/index.md

@@ -8,7 +8,7 @@ type: reference, index, howto
 # Project settings
 
 NOTE: **Note:**
-Only project Maintainers and Admin users have the [permissions](../../permissions.md#project-members-permissions)
+Only project maintainers and administrators have the [permissions](../../permissions.md#project-members-permissions)
 to access a project settings.
 
 You can adjust your [project](../index.md) settings by navigating
@@ -145,7 +145,7 @@ Here you can run housekeeping, archive, rename, transfer, [remove a fork relatio
 
 Archiving a project makes it read-only for all users and indicates that it's
 no longer actively maintained. Projects that have been archived can also be
-unarchived. Only project Owners and Admin users have the
+unarchived. Only project owners and administrators have the
 [permissions](../../permissions.md#project-members-permissions) to archive a project.
 
 When a project is archived, the repository, packages, issues, merge requests, and all
@@ -162,12 +162,12 @@ To archive a project:
 #### Unarchiving a project
 
 Unarchiving a project removes the read-only restriction on a project, and makes it
-available in project listings. Only project Owners and Admin users have the
+available in project listings. Only project owners and administrators have the
 [permissions](../../permissions.md#project-members-permissions) to unarchive a project.
 
 To find an archived project:
 
-1. Sign in to GitLab as a user with project Owner or Admin permissions.
+1. Sign in to GitLab as a user with project owner or administrator permissions.
 1. If you:
    - Have the project's URL, open the project's page in your browser.
    - Don't have the project's URL:
@@ -186,7 +186,7 @@ Next, to unarchive the project:
 #### Renaming a repository
 
 NOTE: **Note:**
-Only project Maintainers and Admin users have the [permissions](../../permissions.md#project-members-permissions) to rename a
+Only project maintainers and administrators have the [permissions](../../permissions.md#project-members-permissions) to rename a
 repository. Not to be confused with a project's name where it can also be
 changed from the [general project settings](#general-project-settings).
 
@@ -207,7 +207,7 @@ old URL won't be able to push or pull. Read more about what happens with the
 #### Transferring an existing project into another namespace
 
 NOTE: **Note:**
-Only project Owners and Admin users have the [permissions](../../permissions.md#project-members-permissions)
+Only project owners and administrators have the [permissions](../../permissions.md#project-members-permissions)
 to transfer a project.
 
 You can transfer an existing project into a [group](../../group/index.md) if:
@@ -229,13 +229,13 @@ read what happens with the
 [redirects from the old project to the new one](../index.md#redirects-when-changing-repository-paths).
 
 NOTE: **Note:**
-GitLab administrators can use the admin interface to move any project to any
+GitLab administrators can use the administration interface to move any project to any
 namespace if needed.
 
 #### Delete a project
 
 NOTE: **Note:**
-Only project owners and admins have [permissions](../../permissions.md#project-members-permissions) to delete a project.
+Only project owners and administrators have [permissions](../../permissions.md#project-members-permissions) to delete a project.
 
 To delete a project:
 
@@ -247,7 +247,7 @@ This action:
 
 - Deletes a project including all associated resources (issues, merge requests etc).
 - From [GitLab 13.2](https://gitlab.com/gitlab-org/gitlab/-/issues/220382) on [Premium or Silver](https://about.gitlab.com/pricing/) or higher tiers,
-group admins can [configure](../../group/index.md#enabling-delayed-project-removal) projects within a group
+group administrators can [configure](../../group/index.md#enabling-delayed-project-removal) projects within a group
 to be deleted after a delayed period.
 When enabled, actual deletion happens after number of days
 specified in [instance settings](../../admin_area/settings/visibility_and_access_controls.md#default-deletion-delay).