Updated mediawiki/extensions
Project: mediawiki/extensions/UploadWizard  25747f0c7257a1dfbe27c0849678ad11f00017af

Add jsduck docs for ConfirmCloseWindow

Starting with something simple, will move forward from here.

Note these docs are mostly for people working on UW itself, so it might
seem questionably useful, but having a consistent format and a way to
check that format is going to prove useful.

Change-Id: I018bc4480e9871953a211601cde5f1cad9a4360d