[media] Fix videodev.h references at the V4L DocBook

Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/DocBook/v4l/pixfmt.xml b/Documentation/DocBook/v4l/pixfmt.xml
index d7c4671..cfffc88 100644
--- a/Documentation/DocBook/v4l/pixfmt.xml
+++ b/Documentation/DocBook/v4l/pixfmt.xml
@@ -142,8 +142,8 @@
 has just as many pad bytes after it as the other rows.</para>
 
     <para>In V4L2 each format has an identifier which looks like
-<constant>PIX_FMT_XXX</constant>, defined in the <link
-linkend="videodev">videodev.h</link> header file. These identifiers
+<constant>PIX_FMT_XXX</constant>, defined in the <filename>videodev2.h</filename>
+header file. These identifiers
 represent <link linkend="v4l2-fourcc">four character codes</link>
 which are also listed below, however they are not the same as those
 used in the Windows world.</para>