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>

include/linux/rwsem.h

@@ -110,7 +110,7 @@ do {								\
 
 /*
  * This is the same regardless of which rwsem implementation that is being used.
- * It is just a heuristic meant to be called by somebody alreadying holding the
+ * It is just a heuristic meant to be called by somebody already holding the
  * rwsem to see if somebody from an incompatible type is wanting access to the
  * lock.
  */