Fixes #36321

Enables missing documentation for:
- actionmailbox/app/controllers/{.,**}/*.rb
- actionmailbox/app/jobs/{.,**}/*.rb
- actionmailbox/app/models/{.,**}/*.rb
- actiontext/app/models/{.,**}/*.rb
- activestorage/app/controllers/{.,**}/*.rb
- activestorage/app/jobs/{.,**}/*.rb
- activestorage/app/models/{.,**}/*.rb