Update Gaia API documents for #a9238975daee10ee5c20e703db0cfee76ae6a7ea
    Bug 952591 - [Messages] Selecting 'Send email' from a message that contains an email address does not launch Email app. r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=952591
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>