Add note about BrowserID choice to deployment doc.
Add note about BrowserID choice to deployment doc.

bobsilverberg/moztrap,shinglyu/moztrap,bobsilverberg/moztrap,bobsilverberg/moztrap,mozilla/moztrap,mccarrmb/moztrap,shinglyu/moztrap,mccarrmb/moztrap,mozilla/moztrap,shinglyu/moztrap,mccarrmb/moztrap,mozilla/moztrap,shinglyu/moztrap,mccarrmb/moztrap,mccarrmb/moztrap,mozilla/moztrap,mozilla/moztrap,shinglyu/moztrap,bobsilverberg/moztrap