Update Gaia API documents for #ff5f06dd321f7d2bf4a5b311ded2c56e865d4f83
    Merge pull request #14591 from daleharvey/946807

Bug 946807 - Dont postResult to activity with no return value r=benfrancis
(cherry picked from commit a14c8ba9fa829cdfa746bda2b88df642daee025a)