[media] DocBook/v4l2.xml: Update version of the spec

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/DocBook/v4l/v4l2.xml

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       <revision>
+	<revnumber>2.6.39</revnumber>
+	<date>2011-03-01</date>
+	<authorinitials>mcc</authorinitials>
+	<revremark>Removed VIDIOC_*_OLD from videodev2.h header and update it to reflect latest changes.
+	</revremark>
+      </revision>
+
+      <revision>
 	<revnumber>2.6.38</revnumber>
 	<date>2011-01-16</date>
 	<authorinitials>po</authorinitials>