jsduck: Clean up odd use of @returns instead of @return

The fast majority in core uses @return, a handful were using
@returns though (which works because JSDuck supports it as alias
for @return).

Also cleaned up minor things in touched areas:
* Hoist second description for jQuery.matchSrcSet (there can only
  be one, it was currently interpreted as continuation of the
  @return caption).
* Remove redundant @method.

Change-Id: I15d1d023f0424e38c58a252139e6bb2f0b36d2b4
Update OOjs UI to v0.1.0-pre (8b13d2b7f7)

New changes:
b983861 Fix OO.ui.ButtonOptionWidget documentation header
621a966 doc: Improve and fix minor issues in base classes
59665a2 Localisation updates from https://translatewiki.net.
d9a0a7d Add icon and indicator widgets

Change-Id: I5cd34605aa13b3cd24dbda5e4c9a5ac9e4584561
Merge "jsduck: Clean up odd use of @returns instead of @return"
Merge "Update OOjs UI to v0.1.0-pre (8b13d2b7f7)"