locking: Fix typos in comments

Fix ~16 single-word typos in locking code comments.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
index fe9cc65..809b001 100644
--- a/kernel/locking/rwsem.c
+++ b/kernel/locking/rwsem.c
@@ -819,7 +819,7 @@ static bool rwsem_optimistic_spin(struct rw_semaphore *sem)
 		 *    we try to get it. The new owner may be a spinnable
 		 *    writer.
 		 *
-		 * To take advantage of two scenarios listed agove, the RT
+		 * To take advantage of two scenarios listed above, the RT
 		 * task is made to retry one more time to see if it can
 		 * acquire the lock or continue spinning on the new owning
 		 * writer. Of course, if the time lag is long enough or the