V4L/DVB (12563): ir-keymaps: add a link to the IR standard layout page

While we're still discussing it, let's point to the wiki page. In
the future, this should be added at V4L2 API spec DocBooks.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/ir-keymaps.c

 /*
-
-
-    Keytables for supported remote controls. This file is part of
-    video4linux.
+    Keytables for supported remote controls, used on drivers/media
+    devices.
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -17,7 +15,13 @@
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
 
+/*
+ * NOTICE FOR DEVELOPERS:
+ *   The IR mappings should be as close as possible to what's
+ *   specified at:
+ *      http://linuxtv.org/wiki/index.php/Remote_Controllers
  */
 #include <linux/module.h>