V4L/DVB: DocBook/v4l/compat.xml: add missing </section>

The indentation of the sections had gone wrong, causing a mistake with
section nesting. Fixed.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/v4l/compat.xml

@@ -2466,6 +2466,7 @@ interfaces and should not be implemented in new drivers.</para>
         </listitem>
       </itemizedlist>
     </section>
+  </section>
 
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