am 774e3418: am cf657324: am c9b5f98b: am 6f5d4bd8: am de91b384: am e385672c: docs: remove reference to GCM doc from C2DM doc

* commit '774e3418c4433e1a5bc6c22c6fa6b4968c9fb696':
  docs: remove reference to GCM doc from C2DM doc