Clean up Vale Admin rule for maintenance mode docs

doc/administration/maintenance_mode/index.md

@@ -75,7 +75,7 @@ An error is displayed when a user tries to perform a write operation that isn't
 NOTE:
 In some cases, the visual feedback from an action could be misleading, for example when starring a project, the **Star** button changes to show the **Unstar** action, however, this is only the frontend update, and it doesn't take into account the failed status of the POST request. These visual bugs are to be fixed [in follow-up iterations](https://gitlab.com/gitlab-org/gitlab/-/issues/295197).
 
-### Admin functions
+### Administrator functions
 
 Systems administrators can edit the application settings. This allows
 them to disable Maintenance Mode after it's been enabled.
@@ -116,11 +116,11 @@ For most JSON requests, POST, PUT, PATCH, and DELETE are blocked, and the API re
 | POST | `/users/sign_in` | To allow users to log in. |
 | POST | `/users/sign_out`| To allow users to log out. |
 | POST | `/oauth/token` | To allow users to log in to a Geo secondary for the first time. |
-| POST | `/admin/session`, `/admin/session/destroy` | To allow [Admin mode for GitLab administrators](https://gitlab.com/groups/gitlab-org/-/epics/2158) |
+| POST | `/admin/session`, `/admin/session/destroy` | To allow [Administrator mode for GitLab administrators](https://gitlab.com/groups/gitlab-org/-/epics/2158) |
 | POST | Paths ending with `/compare`| Git revision routes. |
 | POST | `.git/git-upload-pack` | To allow Git pull/clone. |
 | POST | `/api/v4/internal` | [internal API routes](../../development/internal_api.md) |
-| POST | `/admin/sidekiq` | To allow management of background jobs in the admin UI |
+| POST | `/admin/sidekiq` | To allow management of background jobs in the Admin UI |
 | POST | `/admin/geo` | To allow updating Geo Nodes in the administrator UI |
 | POST | `/api/v4/geo_replication`| To allow certain Geo-specific administrator UI actions on secondary sites |