Update Gaia API documents for #022cf2f453a4b6b32023581caa19092cfb528d47
    Merge pull request #14051 from jmcanterafonseca/fb_migration_datastore

Bug 924139 - Devise and implement a mechanism to migrate FB data between...
(cherry picked from commit 0f2768c9a426c7a405b20dac32a2b46b24a747a0)