[media] V4L2 spec fix

Two small docbook fixes:

- prepare-buf was not positioned in alphabetical order, moved to the right place.
- the format field in create_bufs had the wrong type in the documentation

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/media/v4l/v4l2.xml

@@ -560,14 +560,14 @@ and discussions on the V4L mailing list.</revremark>
     &sub-g-tuner;
     &sub-log-status;
     &sub-overlay;
+    &sub-prepare-buf;
     &sub-qbuf;
     &sub-querybuf;
     &sub-querycap;
     &sub-queryctrl;
     &sub-query-dv-preset;
     &sub-query-dv-timings;
     &sub-querystd;
-    &sub-prepare-buf;
     &sub-reqbufs;
     &sub-s-hw-freq-seek;
     &sub-streamon;

Documentation/DocBook/media/v4l/vidioc-create-bufs.xml

@@ -108,7 +108,7 @@ information.</para>
 /></entry>
 	  </row>
 	  <row>
-	    <entry>&v4l2-format;</entry>
+	    <entry>struct&nbsp;v4l2_format</entry>
 	    <entry><structfield>format</structfield></entry>
 	    <entry>Filled in by the application, preserved by the driver.</entry>
 	  </row>