added notes for new perf fields.
added notes for new perf fields.

magne-max/zipline-ja,otmaneJai/Zipline,otmaneJai/Zipline,semio/zipline,CDSFinance/zipline,jordancheah/zipline,ChinaQuants/zipline,dkushner/zipline,stkubr/zipline,YuepengGuo/zipline,dmitriz/zipline,wubr2000/zipline,StratsOn/zipline,bartosh/zipline,morrisonwudi/zipline,stkubr/zipline,iamkingmaker/zipline,nborggren/zipline,quantopian/zipline,bartosh/zipline,florentchandelier/zipline,ronalcc/zipline,aajtodd/zipline,morrisonwudi/zipline,euri10/zipline,MonoCloud/zipline,humdings/zipline,umuzungu/zipline,Scapogo/zipline,euri10/zipline,alphaBenj/zipline,umuzungu/zipline,YuepengGuo/zipline,alphaBenj/zipline,AlirezaShahabi/zipline,nborggren/zipline,keir-rex/zipline,magne-max/zipline-ja,gwulfs/zipline,humdings/zipline,zhoulingjun/zipline,joequant/zipline,wilsonkichoi/zipline,enigmampc/catalyst,CDSFinance/zipline,ChinaQuants/zipline,DVegaCapital/zipline,michaeljohnbennett/zipline,chrjxj/zipline,cmorgan/zipline,enigmampc/catalyst,quantopian/zipline,chrjxj/zipline,sketchytechky/zipline,MonoCloud/zipline,grundgruen/zipline,sketchytechky/zipline,florentchandelier/zipline,jimgoo/zipline-fork,grundgruen/zipline,jordancheah/zipline,semio/zipline,ronalcc/zipline,joequant/zipline,AlirezaShahabi/zipline,aajtodd/zipline,jimgoo/zipline-fork,dmitriz/zipline,iamkingmaker/zipline,DVegaCapital/zipline,kmather73/zipline,StratsOn/zipline,zhoulingjun/zipline,wilsonkichoi/zipline,Scapogo/zipline,gwulfs/zipline,wubr2000/zipline,kmather73/zipline,michaeljohnbennett/zipline,dkushner/zipline,keir-rex/zipline,cmorgan/zipline