docs/vm: numa: convert to ReST format

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/vm/numa b/Documentation/vm/numa
index a31b85b..c81e7c5 100644
--- a/Documentation/vm/numa
+++ b/Documentation/vm/numa
@@ -1,6 +1,10 @@
+.. _numa:
+
 Started Nov 1999 by Kanoj Sarcar <kanoj@sgi.com>
 
+=============
 What is NUMA?
+=============
 
 This question can be answered from a couple of perspectives:  the
 hardware view and the Linux software view.