State of the documentation:

• "guess case" has its own documentation page already: https://musicbrainz.org/doc/Guess_Case
• "guess featuring" should have one, related to https://musicbrainz.org/doc/Style/Artist_Credits#Featured_artists and https://musicbrainz.org/doc/Style/Classical/Release/Artist#Featured_Release_Artists

These features are available to edit artist credits for release group, release, track, recording.