spelling fixes: mm/

Spelling fixes in mm/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/mm/swap.c b/mm/swap.c
index a65eff8..9ac8832 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -5,7 +5,7 @@
  */
 
 /*
- * This file contains the default values for the opereation of the
+ * This file contains the default values for the operation of the
  * Linux VM subsystem. Fine-tuning documentation can be found in
  * Documentation/sysctl/vm.txt.
  * Started 18.12.91