Adds some notes about idempontency for coordinator impl.
Adds some notes about idempontency for coordinator impl.

mccraigmccraig/onyx,Deraen/onyx,vijaykiran/onyx,dignati/onyx,onyx-platform/onyx,tomasu82/onyx,ideal-knee/onyx,KevinGreene/onyx,iperdomo/onyx,intfrr/onyx