am 99033332: am b6af87ca: am e5bf7064: am 964a4121: Merge "[Improve docs for AccountManager] Currently, the docs for AccountManager are somewhat misleading and may cause developer errors. To avoid them, we are properly documenting it." into mnc-dev

* commit '99033332222fff7084d211a90465f9ddaeeeb321':
  [Improve docs for AccountManager] Currently, the docs for AccountManager are somewhat misleading and may cause developer errors. To avoid them, we are properly documenting it.