Update release notes with recent changes

For some reason these were omitted during their respective commits.

Change-Id: I358354e2333a99ac50b12cdeeb3adf62250996d9
Reviewed-on: http://review.couchbase.org/41299
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>