Document counter_multi and remove_multi
Document counter_multi and remove_multi

Change-Id: I7e93811c9e7bd06cb40082c60136722d2fd9184e
Reviewed-on: http://review.couchbase.org/61778
Reviewed-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>
Tested-by: Mark Nunberg <dab05a0fe859c5cb93882b2a75a0d613501b07be@couchbase.com>

mnunberg/couchbase-python-client,mnunberg/couchbase-python-client,couchbase/couchbase-python-client,couchbase/couchbase-python-client