doc-rst: media-controller.rst: add missing copy symbol

Just like V4L and DVB parts, add the copyright symbol.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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

 .. -*- coding: utf-8; mode: rst -*-
 
+.. include:: <isonum.txt>
+
 .. _media_common:
 
 ####################
@@ -56,8 +58,9 @@ Authors:
 
  - MEDIA_IOC_G_TOPOLOGY documentation and documentation improvements.
 
-**Copyright** 2010 : Laurent Pinchart
-**Copyright** 2015-2016 : Mauro Carvalho Chehab
+**Copyright** |copy| 2010 : Laurent Pinchart
+
+**Copyright** |copy| 2015-2016 : Mauro Carvalho Chehab
 
 ****************
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