Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  e3c90c129400fe66a2b344eecda1731bffec1930

Hygiene: Some upload documentation

Just whilst I was here. Not complete by any means but every little
helps.

Change-Id: Ida73c242fb0ee29fad41eba5b15634cc3d7bf4ca