[media] DocBook: fix various validation errors

Fixed the following errors (with exception of the SVG errors):
  GEN     /home/hans/work/src/v4l/media-git/Documentation/DocBook//v4l2.xml
  rm -rf Documentation/DocBook/index.html; echo '<h1>Linux Kernel HTML Documentation</h1>' >> Documentation/DocBook/index.html && echo '<h2>Kernel Version: 3.8.0-rc1</h2>' >> Documentation/DocBook/index.html && cat Documentation/DocBook/media_api.html >> Documentation/DocBook/index.html
  /tmp/x.xml:883: element revremark: validity error : Element structname is not declared in revremark list of possible children
  /tmp/x.xml:883: element revremark: validity error : Element xref is not declared in revremark list of possible children
  /tmp/x.xml:9580: element xref: validity error : Element xref was declared EMPTY this one has content
  /tmp/x.xml:13508: element link: validity error : Element link does not carry attribute linkend
  /tmp/x.xml:13508: element link: validity error : No declaration for attribute linked of element link
  /tmp/x.xml:16986: element imagedata: validity error : Value "SVG" for attribute format of imagedata is not among the enumerated set
  /tmp/x.xml:17003: element imagedata: validity error : Value "SVG" for attribute format of imagedata is not among the enumerated set
  /tmp/x.xml:17022: element imagedata: validity error : Value "SVG" for attribute format of imagedata is not among the enumerated set

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/DocBook/media/v4l/vidioc-expbuf.xml b/Documentation/DocBook/media/v4l/vidioc-expbuf.xml
index 72dfbd2..e287c8f 100644
--- a/Documentation/DocBook/media/v4l/vidioc-expbuf.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-expbuf.xml
@@ -83,15 +83,14 @@
 <link linkend="dmabuf">DMABUF importing</link> for details about importing
 DMABUF files into V4L2 nodes. It is recommended to close a DMABUF file when it
 is no longer used to allow the associated memory to be reclaimed. </para>
-
   </refsect1>
-  <refsect1>
-   <section>
-      <title>Examples</title>
 
-      <example>
-	<title>Exporting a buffer.</title>
-	<programlisting>
+  <refsect1>
+    <title>Examples</title>
+
+    <example>
+      <title>Exporting a buffer.</title>
+      <programlisting>
 int buffer_export(int v4lfd, &v4l2-buf-type; bt, int index, int *dmafd)
 {
 	&v4l2-exportbuffer; expbuf;
@@ -108,12 +107,12 @@
 
 	return 0;
 }
-        </programlisting>
-      </example>
+      </programlisting>
+    </example>
 
-      <example>
-	<title>Exporting a buffer using the multi-planar API.</title>
-	<programlisting>
+    <example>
+      <title>Exporting a buffer using the multi-planar API.</title>
+      <programlisting>
 int buffer_export_mp(int v4lfd, &v4l2-buf-type; bt, int index,
 	int dmafd[], int n_planes)
 {
@@ -137,12 +136,9 @@
 
 	return 0;
 }
-        </programlisting>
-      </example>
-   </section>
-  </refsect1>
+      </programlisting>
+    </example>
 
-  <refsect1>
     <table pgwide="1" frame="none" id="v4l2-exportbuffer">
       <title>struct <structname>v4l2_exportbuffer</structname></title>
       <tgroup cols="3">