small documentation fixes

Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/mm/Kconfig b/mm/Kconfig
index b1f03b0..c070ec0 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -37,7 +37,7 @@
 	  in their physical address spaces, and this option provides
 	  more efficient handling of these holes.  However, the vast
 	  majority of hardware has quite flat address spaces, and
-	  can have degraded performance from extra overhead that
+	  can have degraded performance from the extra overhead that
 	  this option imposes.
 
 	  Many NUMA configurations will have this as the only option.