Adds note about grouping to split iterators.
Adds note about grouping to split iterators.

SSPkrolik/Nim,tmm1/Nim,msmith491/Nim,bvssvni/Nim,sferik/Nim,douglas-larocca/Nim,sarvex/Nim-lang,singularperturbation/Nim,endragor/Nim,judofyr/Nim,endragor/Nim,SSPkrolik/Nim,judofyr/Nim,Matt14916/Nim,MrJohz/Nim,sferik/Nim,nafsaka/Nim,reactormonk/nim,fmamud/Nim,bvssvni/Nim,nanoant/Nim,tmm1/Nim,jsanjuas/Nim,msmith491/Nim,mbaulch/Nim,BlaXpirit/nim,nanoant/Nim,sarvex/Nim-lang,dom96/Nim,reactormonk/nim,russpowers/Nim,MrJohz/Nim,xland/Nim,fmamud/Nim,douglas-larocca/Nim,tulayang/Nim,nanoant/Nim,reactormonk/nim,xland/Nim,sferik/Nim,endragor/Nim,dom96/Nim,Matt14916/Nim,nanoant/Nim,nanoant/Nim,nanoant/Nim,fredericksilva/Nim,gokr/Nim,endragor/Nim,kirbyfan64/Nim,fmamud/Nim,fredericksilva/Nim,russpowers/Nim,sarvex/Nim-lang,greyanubis/Nim,BlaXpirit/nim,sarvex/Nim-lang,jfhg/Nim,russpowers/Nim,Matt14916/Nim,jfhg/Nim,russpowers/Nim,msmith491/Nim,zachaysan/Nim,msmith491/Nim,jsanjuas/Nim,douglas-larocca/Nim,reactormonk/nim,SSPkrolik/Nim,greyanubis/Nim,nafsaka/Nim,reactormonk/nim,Salafit/Nim,Matt14916/Nim,douglas-larocca/Nim,singularperturbation/Nim,singularperturbation/Nim,Senketsu/Nim,BlaXpirit/nim,tulayang/Nim,bvssvni/Nim,judofyr/Nim,haiodo/Nim,Dhertz/Nim,xland/Nim,Dhertz/Nim,jsanjuas/Nim,Senketsu/Nim,fredericksilva/Nim,nafsaka/Nim,nimLuckyBull/Nim,tulayang/Nim,Matt14916/Nim,fredericksilva/Nim,Dhertz/Nim,jfhg/Nim,nanoant/Nim,zachaysan/Nim,BlaXpirit/nim,tulayang/Nim,fredericksilva/Nim,jsanjuas/Nim,Senketsu/Nim,fmamud/Nim,gokr/Nim,gokr/Nim,fmamud/Nim,Salafit/Nim,haiodo/Nim,Dhertz/Nim,judofyr/Nim,kirbyfan64/Nim,haiodo/Nim,JCavallo/Nim,nimLuckyBull/Nim,tulayang/Nim,endragor/Nim,JCavallo/Nim,bvssvni/Nim,zachaysan/Nim,judofyr/Nim,reactormonk/nim,nafsaka/Nim,nafsaka/Nim,jfhg/Nim,greyanubis/Nim,greyanubis/Nim,kirbyfan64/Nim,JCavallo/Nim,sarvex/Nim-lang,bvssvni/Nim,russpowers/Nim,BlaXpirit/nim,MrJohz/Nim,fredericksilva/Nim,sferik/Nim,tmm1/Nim,mbaulch/Nim,xland/Nim,sferik/Nim,BlaXpirit/nim,douglas-larocca/Nim,JCavallo/Nim,tmm1/Nim,MrJohz/Nim,nimLuckyBull/Nim,MrJohz/Nim,Senketsu/Nim,dom96/Nim,jfhg/Nim,sarvex/Nim-lang,douglas-larocca/Nim,dom96/Nim,Senketsu/Nim,sferik/Nim,zachaysan/Nim,Dhertz/Nim,SSPkrolik/Nim,mbaulch/Nim,Matt14916/Nim,kirbyfan64/Nim,tmm1/Nim,jsanjuas/Nim,gokr/Nim,fredericksilva/Nim,kirbyfan64/Nim,msmith491/Nim,singularperturbation/Nim,Dhertz/Nim,reactormonk/nim,douglas-larocca/Nim,judofyr/Nim,msmith491/Nim,JCavallo/Nim,nafsaka/Nim,nimLuckyBull/Nim,mbaulch/Nim,JCavallo/Nim,bvssvni/Nim,russpowers/Nim,kirbyfan64/Nim,Senketsu/Nim,MrJohz/Nim,Dhertz/Nim,JCavallo/Nim,haiodo/Nim,BlaXpirit/nim,jsanjuas/Nim,MrJohz/Nim,fmamud/Nim,jfhg/Nim,tulayang/Nim,zachaysan/Nim,judofyr/Nim,sarvex/Nim-lang,zachaysan/Nim,dom96/Nim,greyanubis/Nim,singularperturbation/Nim,dom96/Nim,mbaulch/Nim,tmm1/Nim,gokr/Nim,haiodo/Nim,msmith491/Nim,SSPkrolik/Nim,singularperturbation/Nim,Senketsu/Nim,xland/Nim,gokr/Nim,SSPkrolik/Nim,SSPkrolik/Nim,sferik/Nim,Salafit/Nim,gokr/Nim,kirbyfan64/Nim,greyanubis/Nim,dom96/Nim,Salafit/Nim,greyanubis/Nim,gokr/Nim,tmm1/Nim,reactormonk/nim,singularperturbation/Nim,endragor/Nim,SSPkrolik/Nim,judofyr/Nim,jsanjuas/Nim,douglas-larocca/Nim,Salafit/Nim,BlaXpirit/nim,nimLuckyBull/Nim,jfhg/Nim,nafsaka/Nim,xland/Nim,mbaulch/Nim,Matt14916/Nim,fredericksilva/Nim,bvssvni/Nim,xland/Nim,nimLuckyBull/Nim,Salafit/Nim,kirbyfan64/Nim,russpowers/Nim,endragor/Nim,zachaysan/Nim,nimLuckyBull/Nim,Salafit/Nim,mbaulch/Nim,fmamud/Nim,haiodo/Nim,haiodo/Nim,sferik/Nim