Fix up the docs warning detected by the vale Admin rule

doc/api/pages_domains.md

@@ -12,7 +12,7 @@ The GitLab Pages feature must be enabled to use these endpoints. Find out more a
 
 ## List all Pages domains
 
-Get a list of all Pages domains. The user must have admin permissions.
+Get a list of all Pages domains. The user must have the administrator role.
 
 ```plaintext
 GET /pages/domains

doc/api/personal_access_tokens.md

@@ -95,6 +95,6 @@ curl --request DELETE --header "PRIVATE-TOKEN: <your_access_token>" "https://git
 - `204: No Content` if successfully revoked.
 - `400 Bad Request` if not revoked successfully.
 
-## Create a personal access token (admin only)
+## Create a personal access token (administrator only)
 
 See the [Users API documentation](users.md#create-a-personal-access-token) for information on creating a personal access token.

doc/development/scalability.md

@@ -45,7 +45,7 @@ many groups or projects, and the access level (including guest, developer, or
 maintainer) to groups and projects determines what users can see and
 what they can access.
 
-Users with admin access can access all projects and even impersonate
+Users with the administrator role can access all projects and even impersonate
 users.
 
 #### Sharding and partitioning