[media] DocBook: Add return error codes to LIRC ioctl session

Add a reference for the generic error code chapter to LIRC ioctl
description.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/media/v4l/lirc_device_interface.xml

@@ -246,10 +246,8 @@ on working with the default settings initially.</para>
     </listitem>
   </varlistentry>
 </variablelist>
-
-</section>
-
 <section id="lirc_dev_errors">
-    &return-value;
+  &return-value;
+</section>
 </section>
 </section>