[media] DocBook media: document the new V4L2_DV_FL_IS_CE_VIDEO flag

Document this new flag.

Signed-off-by: Hans Verkuil <[e-mail]>
Cc: Martin Bugge <[e-mail]>
Cc: Mats Randgaard <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/DocBook/media/v4l/vidioc-g-dv-timings.xml

···
 the hardware.
 	    </entry>
 	  </row>
+	  <row>
+	    <entry>V4L2_DV_FL_IS_CE_VIDEO</entry>
+	    <entry>If set, then this is a Consumer Electronics (CE) video format.
+Such formats differ from other formats (commonly called IT formats) in that if
+R'G'B' encoding is used then by default the R'G'B' values use limited range
+(i.e. 16-235) as opposed to full range (i.e. 0-255). All formats defined in CEA-861
+except for the 640x480p59.94 format are CE formats.
+	    </entry>
+	  </row>
 	</tbody>
       </tgroup>
     </table>