locking/rtmutex: Rename argument in the rt_mutex_adjust_prio_chain() documentation as well

The following commit changed "deadlock_detect" to "chwalk":

   8930ed80 ("rtmutex: Cleanup deadlock detector debug logic")

do that rename in the function's documentation as well.
Signed-off-by: NTom(JeHyeon) Yeon <tom.yeon@windriver.com>
Cc: peterz@infradead.org
Link: http://lkml.kernel.org/r/1426655010-31651-1-git-send-email-tom.yeon@windriver.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

kernel/locking/rtmutex.c

@@ -349,7 +349,7 @@ static inline struct rt_mutex *task_blocked_on_lock(struct task_struct *p)
  *
  * @task:	the task owning the mutex (owner) for which a chain walk is
  *		probably needed
- * @deadlock_detect: do we have to carry out deadlock detection?
+ * @chwalk:	do we have to carry out deadlock detection?
  * @orig_lock:	the mutex (can be NULL if we are walking the chain to recheck
  *		things for a task that has just got its priority adjusted, and
  *		is waiting on a mutex)