Update Gaia API documents for #98cd39268c481be11ea697642dd438e9f7db0be3
    Bug 959839 - [Messages] multi-word search cannot find contacts with multi-word names r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=959839
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>