Merge branch 'doc-admin-housekeeping' into 'master'

Update housekeeping docs for new GitLab UI.

I spent far too much time trying to find this button.

See merge request !6679

doc/administration/housekeeping.md

@@ -12,7 +12,7 @@ revisions (to reduce disk space and increase performance) and removing
 unreachable objects which may have been created from prior invocations of
 `git add`.
 
-You can find this option under your **[Project] > Settings**.
+You can find this option under your **[Project] > Edit Project**.
 
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