docs/memory-barriers.txt: Add wait_event_cmd() and wait_event_exclusive_cmd()

Add said functions to Documentation/memory-barriers.txt.

Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>

--

v1 -> v2:
      * Changed the prosaic part to kernel-doc style and moved it to
        include/linux/wait.h in another commit

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
1 file changed