sched: fix typos in documentation

Fixed typos in function documentation.

Signed-off-by: Luis Henriques <henrix@sapo.pt>
LKML-Reference: <20090316195809.GA6073@hades.domain.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 2f28351..489e7d9 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2082,7 +2082,7 @@
 		 * it must be off the runqueue _entirely_, and not
 		 * preempted!
 		 *
-		 * So if it wa still runnable (but just not actively
+		 * So if it was still runnable (but just not actively
 		 * running right now), it's preempted, and we should
 		 * yield - it could be a while.
 		 */
@@ -2574,7 +2574,7 @@
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 
 /**
- * preempt_notifier_register - tell me when current is being being preempted & rescheduled
+ * preempt_notifier_register - tell me when current is being preempted & rescheduled
  * @notifier: notifier struct to register
  */
 void preempt_notifier_register(struct preempt_notifier *notifier)