Update Gaia API documents for #2b116456d8a3ed3e9741b370d628f225c58587da
    Merge pull request #14797 from dwi2/bug937561

Bug 937561 - get both available network list and known network list, and...
(cherry picked from commit 065cba7bd8c3d8ad0ec424c2c2893b96bae6e54d)