[media] docs-rst: Convert V4L2 uAPI to use C function references

Name all ioctl references and make them match the ioctls that
are documented. That will improve the cross-reference index,
as it will have all ioctls and syscalls there.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/vidioc-enumoutput.rst

@@ -15,7 +15,8 @@ VIDIOC_ENUMOUTPUT - Enumerate video outputs
 Synopsis
 ========
 
-.. c:function:: int ioctl( int fd, int request, struct v4l2_output *argp )
+.. c:function:: int ioctl( int fd, VIDIOC_ENUMOUTPUT, struct v4l2_output *argp )
+    :name: VIDIOC_ENUMOUTPUT
 
 
 Arguments
@@ -24,9 +25,6 @@ Arguments
 ``fd``
     File descriptor returned by :ref:`open() <func-open>`.
 
-``request``
-    VIDIOC_ENUMOUTPUT
-
 ``argp``