add note about utilities being private to docs
add note about utilities being private to docs

gtomitsuka/connect,llwanghong/connect,dkfiresky/connect,chinazhaghai/connect,RoseTHERESA/connect,RickyDan/connect,khirayama/connect,keenwon/connect,behind2/connect,tanveer12332/connect,khalerc/connect,wghust/connect,davehorton/drachtio,qitianchan/connect,mi2oon/connect,senchalabs/connect,mi2oon/connect,austincitylimits/connect,lian774739140/connect,liuwei9413/connect