am 879592d8: am bc64716c: am a2739fa7: am a4c5bba0: add document about GoogleApiClient and one about GoogleAuthUtil also remove the Authorization document from the Google Services section. bug:10679818

* commit '879592d89a78383a9e3cd29d53357f34337e5f04':
  add document about GoogleApiClient and one about GoogleAuthUtil also remove the Authorization document from the Google Services section. bug:10679818