update doc to reflect that times passes index to iterator
update doc to reflect that times passes index to iterator

Joanna913/underscore,singhsterabhi/underscore,strongconjunctions/underscore,jordanwink201/underscore,xiaoqiang730730/underscore,Tim-Zhang/underscore,mjhasbach/underscore,ElseZhang/underscore,platinumazure/underscore,wxmfront/underscore,strongconjunctions/underscore,mitar/underscore,lqjack/underscore,Feiyang1/underscore,colemakdvorak/underscore,sdwang/underscore,dkusch/underscore,kuychaco/underscore,thiswildorchid/underscore,ThiagoGarciaAlves/underscore,craigmichaelmartin/underscore,elancom/underscore,jolthoff/underscore,jashkenas/underscore,nickkneafsey/underscore,huangnan1/2016gitStudy,SerenoShen/underscore,Yangani/underscore,zabefloyd/underscore,emiel187/underscore,mitar/underscore,JonAbrams/underscore,cintiamh/underscore,kairyan/underscore,wjb12/underscore,lis186/underscore,Gimcrack/underscore,cailong1028/underscore,jpalomar/underscore,npmcomponent/jashkenas-underscore,componentizr/underscore,cgvarela/underscore,jiankers/underscore,roychen-7/underscore,kanso/underscore,cintiamh/underscore,mairasala/underscore,zabefloyd/underscore,roychen-7/underscore,liminghui/underscore,imsingh/underscore,ijidan/underscore,megawac/underscore,ryanwholey/underscore,eaglesjava/underscore,premkumargithub/underscore,zhangguangyong/underscore,kairyan/underscore,snackshen/underscore,Feiyang1/underscore,documentcloud/underscore,janocat/underscore,jashkenas/underscore,SeriaWei/underscore,elancom/underscore,oss6/underscore,starterstep/underscore,beenlee/underscore,keepgoingwm/underscore,jridgewell/underscore,lucasfanning/underscore,Forever8/underscore,RepmujNetsik/underscore,mdboop/underscore,SeriaWei/underscore,tnga/underscore-es,beenlee/underscore,huangnan1/2016gitStudy,emiel187/underscore,prosenjit-itobuz/underscore,debutt/underscore,Aplopio/underscore,yuhualingfeng/underscore,hackreactor/underscore,lis186/underscore,thisismygithub/underscore,rlugojr/underscore,michaelficarra/underscore,cgvarela/underscore,ryanwholey/underscore,Forever8/underscore,kuychaco/underscore,amdjs/underscore,falqas/underscore,snackshen/underscore,Gimcrack/underscore,oss6/underscore,SerenoShen/underscore,eaglesjava/underscore,youprofit/underscore,platinumazure/underscore,AaronNGray/underscore-server,kwangkim/underscore,prosenjit-itobuz/underscore,ijidan/underscore,Tim-Zhang/underscore,jordanwink201/underscore,Aplopio/underscore,Joanna913/underscore,huzion/underscore,yuhualingfeng/underscore,nickkneafsey/underscore,jonot/underscore,ThiagoGarciaAlves/underscore,jianganglu/underscore,thiswildorchid/underscore,starterstep/underscore,greyhwndz/underscore,rlugojr/underscore,amdjs/underscore,greyhwndz/underscore,jonot/underscore,PengShi-sp/underscore,PUSEN/underscore,colemakdvorak/underscore,vincent1988/underscore,kanso/underscore,ElseZhang/underscore,craigmichaelmartin/underscore,singhsterabhi/underscore,ereddate/underscore,WangRex/underscore,youprofit/underscore,ligson/underscore,dyx/underscore,keepgoingwm/underscore,bkillenit/underscore,imsingh/underscore,WangRex/underscore,xiaoqiang730730/underscore,jpalomar/underscore,premkumargithub/underscore,gougouGet/underscore,janocat/underscore,ereddate/underscore,LiskHQ/underscore,liyandalmllml/underscore,veg/underscore,debutt/underscore,vincent1988/underscore,JoaquinSiabra/underscore,cnwhy/underscore,mairasala/underscore,jdelbello/underscore,JonAbrams/underscore,irr/underscore,jridgewell/underscore,paulfalgout/underscore,dxuehu/underscore,PengShi-sp/underscore,michaelficarra/underscore,vinodbonala/underscore,aziz-boudi4/underscore,bkillenit/underscore,yekg880809/underscore,gougouGet/underscore,JoaquinSiabra/underscore,LiskHQ/underscore,thisismygithub/underscore,mdboop/underscore,natac13/underscore,1800joe/underscore,lucasfanning/underscore,huzion/underscore,lqjack/underscore,mjhasbach/underscore,braddunbar/underscore,jfarid27/underscore,wjb12/underscore,aziz-boudi4/underscore,vinodbonala/underscore,jianganglu/underscore,Tetpay/underscore,polandeme/underscore,cnwhy/underscore,irr/underscore,dxuehu/underscore,documentcloud/underscore,falqas/underscore,dimitriwalters/underscore,RepmujNetsik/underscore,PUSEN/underscore,akre54/underscore,natac13/underscore,yekg880809/underscore,dkusch/underscore,appleboy/underscore,akre54/underscore,wxmfront/underscore,jdelbello/underscore,kwangkim/underscore,sdwang/underscore,ligson/underscore,liyandalmllml/underscore,AaronNGray/underscore-server,hackreactor/underscore,dfurtado/underscore,jiankers/underscore,jolthoff/underscore,zhangguangyong/underscore,dfurtado/underscore,tnga/underscore-es,jfarid27/underscore,liminghui/underscore,dyx/underscore,Yangani/underscore,veg/underscore,polandeme/underscore,1800joe/underscore