Remove comment on top of release notes

This comment is intended for authors, not users :)

Change-Id: I4a029ef120fae20ac9b571bf997047078308c459
Reviewed-on: http://review.couchbase.org/39307
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>