The new way to display help will greatly simplify and prettify documentation such as https://www.mediawiki.org/wiki/Help:Extension:Translate/API#Web-API
I would be even happier if https://translatewiki.net/w/api.php?action=help&modules=query+messagecollection%7Cquery+messagegroups%7Cquery+messagegroupstats%7Cquery+messagetranslations%7Ctranslationreview%7Cttmserver%7Cgroupreview and similar could be replaced by some concise alternative.
We do have $ ack "ingroup API TranslateAPI"
14: * @ingroup API TranslateAPI
etc., but I doubt that helps anything. It would be nice if the groups could be exposed in more ways.