mm: fix wake_page_function() comment typos

Sedat Dilek pointed out some silly comment typo issues.
Reported-by: NSedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/filemap.c

@@ -990,7 +990,7 @@ void __init pagecache_init(void)
 
 /*
  * The page wait code treats the "wait->flags" somewhat unusually, because
- * we have multiple different kinds of waits, not just he usual "exclusive"
+ * we have multiple different kinds of waits, not just the usual "exclusive"
  * one.
  *
  * We have:
@@ -1011,7 +1011,7 @@ void __init pagecache_init(void)
  *
  *	This is the traditional exclusive wait.
  *
- *  (b) WQ_FLAG_EXCLUSIVE | WQ_FLAG_CUSTOM:
+ *  (c) WQ_FLAG_EXCLUSIVE | WQ_FLAG_CUSTOM:
  *
  *	The waiter is waiting to get the bit, and additionally wants the
  *	lock to be transferred to it for fair lock behavior. If the lock