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 'bc64716cfb1269d07b64f89c3b46800afa5dc266':
  add document about GoogleApiClient and one about GoogleAuthUtil also remove the Authorization document from the Google Services section. bug:10679818