[media] Documentation/DocBook: Rename media fops xml files

By convention, the name of the XML file should match the references
declared at media-entities.tmpl, as, otherwise, some validation
scripts break.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/DocBook/v4l/media-controller.xml b/Documentation/DocBook/v4l/media-controller.xml
index 2dc25e1..873ac3a 100644
--- a/Documentation/DocBook/v4l/media-controller.xml
+++ b/Documentation/DocBook/v4l/media-controller.xml
@@ -78,9 +78,9 @@
 <appendix id="media-user-func">
   <title>Function Reference</title>
   <!-- Keep this alphabetically sorted. -->
-  &sub-media-open;
-  &sub-media-close;
-  &sub-media-ioctl;
+  &sub-media-func-open;
+  &sub-media-func-close;
+  &sub-media-func-ioctl;
   <!-- All ioctls go here. -->
   &sub-media-ioc-device-info;
   &sub-media-ioc-enum-entities;