Fix up the docs warning detected by the vale Admin rule

doc/api/members.md

@@ -336,7 +336,7 @@ The response represents only direct memberships. Inherited memberships are not i
 
 This API endpoint works on top-level groups only. It does not work on subgroups.
 
-This API endpoint requires permission to admin memberships for the group.
+This API endpoint requires permission to administer memberships for the group.
 
 This API endpoint takes [pagination](index.md#pagination) parameters `page` and `per_page` to restrict the list of memberships.
 

doc/api/pages.md

@@ -12,7 +12,7 @@ The GitLab Pages feature must be enabled to use these endpoints. Find out more a
 
 ## Unpublish pages
 
-Remove pages. The user must have admin privileges.
+Remove pages. The user must have the Administrator role.
 
 ```plaintext
 DELETE /projects/:id/pages