[media] doc-rst: Group function references together for MC

Just like the other parts of the media book, group the MC
functions together on one chapter.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/mediactl/media-controller.rst

@@ -22,27 +22,9 @@ Media Controller
     media-controller-intro
     media-controller-model
     media-types
+    media-funcs
     media-header
 
-.. _media-user-func:
-
-******************
-Function Reference
-******************
-
-
-.. toctree::
-    :maxdepth: 1
-
-    media-func-open
-    media-func-close
-    media-func-ioctl
-    media-ioc-device-info
-    media-ioc-g-topology
-    media-ioc-enum-entities
-    media-ioc-enum-links
-    media-ioc-setup-link
-
 
 **********************
 Revision and Copyright

Documentation/media/uapi/mediactl/media-funcs.rst

+.. _media-user-func:
+
+******************
+Function Reference
+******************
+
+
+.. toctree::
+    :maxdepth: 1
+
+    media-func-open
+    media-func-close
+    media-func-ioctl
+    media-ioc-device-info
+    media-ioc-g-topology
+    media-ioc-enum-entities
+    media-ioc-enum-links
+    media-ioc-setup-link