criu(1): change COPYRIGHT section name and years

1 It should be COPYRIGHT not COPYING

2 Happy New Year!
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Documentation/criu.txt

@@ -179,6 +179,6 @@ AUTHOR
 ------
 OpenVZ team.
 
-COPYING
--------
-Copyright \(C) 2011-2012, Parallels Inc.
+COPYRIGHT
+---------
+Copyright \(C) 2011-2013, Parallels Inc.