Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  0ac7a594c368e0605f3db5109e5667360189f874

Fix "@param null $param" documentations

... and a bunch of other documentation details that are closely
connected to these mistakes.

Change-Id: I78e5f10214d6cd457b87ffcd7026f9847c090b5f