Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  84ec9c7ae5bd6dad0b8b703cc3a3776706a4271e

Fix @covers tags in WikibaseLib

Fix @covers tags and remove invalid per-method @covers
tags in formatters.

Change-Id: I5785f887d1d428ef75642f8e57988c201717df65