Legoktm has just merged Gerrit change 160798,[1] Gerrit change 161093,[2] Gerrit change 160819,[3] and a few associated patches. Collectively, these make the following changes to the human-readable aspects of the API output, which will be deployed to WMF wikis with 1.25wmf4 (see
https://www.mediawiki.org/wiki/MediaWiki_1.25/Roadmap for the schedule).
* action=help now outputs a nice HTML page instead of a plain-text document wrapped in XML.
* Hitting api.php with no parameters will display help for the main module only, with links to each submodule. One of the examples provided shows how to get everything on one page as with the old help.