Hygiene: Update mediaviewer, mobile redirect, and nearby documentation

Change-Id: I17e698164e27bec5ee506b337d21d8645a4dd7af
Hygiene: Update notifications, preferred languages, and references documentation

Change-Id: Id3ce3fdef807ba1e15afad8e68b9f96dc253e90b
Merge "Hygiene: Update mediaviewer, mobile redirect, and nearby documentation"
Merge "Hygiene: Update notifications, preferred languages, and references documentation"