PYCBC-154: [docs] fixup OBS_* namespace

Change-Id: Ibb71cdc0b0c780178c738bfedd52651d6d1c0d86
Reviewed-on: http://review.couchbase.org/27400
Tested-by: Mordechai Nunberg <mnunberg@haskalah.org>
Reviewed-by: Volker Mische <volker.mische@gmail.com>
[docs] Document 'cas' property in OperationResult

Change-Id: I8cb80309393c02fb7fe3019c694f6401986670d3
Reviewed-on: http://review.couchbase.org/27401
Tested-by: Mordechai Nunberg <mnunberg@haskalah.org>
Reviewed-by: Volker Mische <volker.mische@gmail.com>