mm: fix cleancache debugfs directory path

Minor fixes for cleancache about wrong debugfs paths
in documentation and code comment.

Signed-off-by: Marcin Jabrzyk <m.jabrzyk@samsung.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/vm/cleancache.txt b/Documentation/vm/cleancache.txt
index 142fbb0..01d7628 100644
--- a/Documentation/vm/cleancache.txt
+++ b/Documentation/vm/cleancache.txt
@@ -85,7 +85,7 @@
 CLEANCACHE PERFORMANCE METRICS
 
 If properly configured, monitoring of cleancache is done via debugfs in
-the /sys/kernel/debug/mm/cleancache directory.  The effectiveness of cleancache
+the /sys/kernel/debug/cleancache directory.  The effectiveness of cleancache
 can be measured (across all filesystems) with:
 
 succ_gets	- number of gets that were successful