Update libjingle license statements at top of talk files for consistency

BUG=2133
R=juberti@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/39559004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8105 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/examples/peerconnection/server/data_socket.cc b/talk/examples/peerconnection/server/data_socket.cc
index 7495025..44305bc 100644
--- a/talk/examples/peerconnection/server/data_socket.cc
+++ b/talk/examples/peerconnection/server/data_socket.cc
@@ -1,6 +1,6 @@
 /*
  * libjingle
- * Copyright 2011, Google Inc.
+ * Copyright 2011 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met: