Documentation/vm/pagemap.txt: correct location of page-types tool

The page-types tool was relocated to tools/vm in the 3.4 kernel timeframe.

Signed-off-by: Randy Wright <rwright@hp.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
index 6fbd55e..6bfbc17 100644
--- a/Documentation/vm/pagemap.txt
+++ b/Documentation/vm/pagemap.txt
@@ -131,7 +131,8 @@
 13. SWAPCACHE   page is mapped to swap space, ie. has an associated swap entry
 14. SWAPBACKED  page is backed by swap/RAM
 
-The page-types tool in this directory can be used to query the above flags.
+The page-types tool in the tools/vm directory can be used to query the
+above flags.
 
 Using pagemap to do something useful: