GitLab: fix description of what admins can do

wiki/src/contribute/working_together/GitLab.mdwn

@@ -487,11 +487,13 @@ This can be useful, for example:
 
 ### Subjects
 
- - An _admin_ can do anything that other roles can, and:
-   - can delete issues
-   - can edit team membership
+ - An _admin_:
+   - can configure GitLab
+     - As a consequence, an admin can grant themselves
+       any permission they want if an emergency requires it;
+       in other situations, better follow due process to request
+       such status or permissions :)
    - MUST comply with our "Level 3" security policy
-   - can view issues that contain particularly sensitive data
 
  - A _committer_:
    - can push and force-push to any ref in the canonical Git repo,