Update env var docs re: #7
Update env var docs re: #7

pgroudas/fabric,xLegoz/fabric,qinrong/fabric,haridsv/fabric,fernandezcuesta/fabric,rodrigc/fabric,amaniak/fabric,cgvarela/fabric,likesxuqiang/fabric,jaraco/fabric,opavader/fabric,cmattoon/fabric,tolbkni/fabric,itoed/fabric,akaariai/fabric,kmonsoor/fabric,SamuelMarks/fabric,MjAbuz/fabric,elijah513/fabric,rbramwell/fabric,askulkarni2/fabric,tekapo/fabric,sdelements/fabric,pashinin/fabric,mathiasertl/fabric,ericholscher/fabric,rane-hs/fabric-py3,bitmonk/fabric,TarasRudnyk/fabric,felix-d/fabric,getsentry/fabric,ploxiln/fabric,bitprophet/fabric,raimon49/fabric,StackStorm/fabric,hrubi/fabric,kxxoling/fabric,bspink/fabric