sched: Fix docbook parameter annotation error in wait.h

Missing "@" in include/linux/wait.h causes "make htmldocs" to fail
with the following warning messages:

  Warning(/home/iida/Repo/linux-next//include/linux/wait.h:304):
  No description found for parameter 'cmd1'
  Warning(/home/iida/Repo/linux-next//include/linux/wait.h:304):
  No description found for parameter 'cmd2'
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Cc: trivial@kernel.org
Cc: peterz@infradead.org
Link: http://lkml.kernel.org/r/1390321326-23120-1-git-send-email-standby24x7@gmail.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/wait.h

@@ -286,8 +286,8 @@ do {									\
  * wait_event_cmd - sleep until a condition gets true
  * @wq: the waitqueue to wait on
  * @condition: a C expression for the event to wait for
- * cmd1: the command will be executed before sleep
- * cmd2: the command will be executed after sleep
+ * @cmd1: the command will be executed before sleep
+ * @cmd2: the command will be executed after sleep
  *
  * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
  * @condition evaluates to true. The @condition is checked each time