Revert "Merge branch 'eread/improve-rake-task-topics' into 'master'"

What does this MR do?

This inadvertently broke master since a test was relying on the content of the doc/administration/raketasks/maintenance.md file.

Reverting is the simplest solution to fix master, then we should make sure we run the specs if doc/administration/raketasks/maintenance.md is modified, or update the test to not check the file's content (simpler).

Fixes #215621 (closed).