Adds more docstrings to the sets module.
Adds more docstrings to the sets module.

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