[media] DocBook/v4l: fix validation errors

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/DocBook/v4l/v4l2.xml b/Documentation/DocBook/v4l/v4l2.xml
index 9c7a175..c3d6991 100644
--- a/Documentation/DocBook/v4l/v4l2.xml
+++ b/Documentation/DocBook/v4l/v4l2.xml
@@ -129,6 +129,7 @@
 
       <revision>
 	<revnumber>2.6.38</revnumber>
+	<date>2011-01-16</date>
 	<authorinitials>po</authorinitials>
 	<revremark>Added the <link linkend="planar-apis">multi-planar API</link>.
 	</revremark>