Added doctests/ documentation
Added doctests/ documentation

sunny94/temp,abhiii5459/sympy,pbrady/sympy,yashsharan/sympy,kevalds51/sympy,Davidjohnwilson/sympy,Vishluck/sympy,shikil/sympy,MridulS/sympy,grevutiu-gabriel/sympy,cccfran/sympy,rahuldan/sympy,toolforger/sympy,liangjiaxing/sympy,moble/sympy,rahuldan/sympy,grevutiu-gabriel/sympy,iamutkarshtiwari/sympy,ga7g08/sympy,pbrady/sympy,mcdaniel67/sympy,hargup/sympy,sunny94/temp,madan96/sympy,madan96/sympy,meghana1995/sympy,sunny94/temp,asm666/sympy,yukoba/sympy,bukzor/sympy,ga7g08/sympy,hrashk/sympy,maniteja123/sympy,aktech/sympy,wanglongqi/sympy,chaffra/sympy,moble/sympy,kmacinnis/sympy,postvakje/sympy,lindsayad/sympy,VaibhavAgarwalVA/sympy,Gadal/sympy,pandeyadarsh/sympy,dqnykamp/sympy,beni55/sympy,meghana1995/sympy,cswiercz/sympy,ga7g08/sympy,abloomston/sympy,souravsingh/sympy,sahilshekhawat/sympy,cccfran/sympy,Shaswat27/sympy,abhiii5459/sympy,liangjiaxing/sympy,ahhda/sympy,rahuldan/sympy,mcdaniel67/sympy,asm666/sympy,Titan-C/sympy,beni55/sympy,AkademieOlympia/sympy,iamutkarshtiwari/sympy,saurabhjn76/sympy,jamesblunt/sympy,kaichogami/sympy,beni55/sympy,kmacinnis/sympy,atsao72/sympy,jbbskinny/sympy,Curious72/sympy,Titan-C/sympy,diofant/diofant,dqnykamp/sympy,MridulS/sympy,dqnykamp/sympy,shipci/sympy,srjoglekar246/sympy,abloomston/sympy,skidzo/sympy,flacjacket/sympy,Sumith1896/sympy,moble/sympy,atreyv/sympy,MridulS/sympy,abloomston/sympy,shipci/sympy,kevalds51/sympy,skidzo/sympy,jbbskinny/sympy,wanglongqi/sympy,Designist/sympy,MechCoder/sympy,yukoba/sympy,oliverlee/sympy,amitjamadagni/sympy,VaibhavAgarwalVA/sympy,AunShiLord/sympy,lidavidm/sympy,drufat/sympy,Shaswat27/sympy,Curious72/sympy,drufat/sympy,AunShiLord/sympy,atreyv/sympy,ahhda/sympy,wanglongqi/sympy,farhaanbukhsh/sympy,abhiii5459/sympy,souravsingh/sympy,debugger22/sympy,Designist/sympy,kaichogami/sympy,debugger22/sympy,shikil/sympy,Vishluck/sympy,sampadsaha5/sympy,cswiercz/sympy,Shaswat27/sympy,AkademieOlympia/sympy,sahmed95/sympy,mafiya69/sympy,sahilshekhawat/sympy,jerli/sympy,liangjiaxing/sympy,lindsayad/sympy,Sumith1896/sympy,hrashk/sympy,Davidjohnwilson/sympy,lidavidm/sympy,maniteja123/sympy,grevutiu-gabriel/sympy,garvitr/sympy,jaimahajan1997/sympy,skirpichev/omg,skidzo/sympy,VaibhavAgarwalVA/sympy,aktech/sympy,saurabhjn76/sympy,kumarkrishna/sympy,emon10005/sympy,souravsingh/sympy,jamesblunt/sympy,debugger22/sympy,amitjamadagni/sympy,yukoba/sympy,atsao72/sympy,ahhda/sympy,iamutkarshtiwari/sympy,chaffra/sympy,Davidjohnwilson/sympy,kaichogami/sympy,Arafatk/sympy,bukzor/sympy,vipulroxx/sympy,wyom/sympy,garvitr/sympy,Curious72/sympy,chaffra/sympy,jaimahajan1997/sympy,Arafatk/sympy,Arafatk/sympy,postvakje/sympy,shikil/sympy,sahmed95/sympy,lindsayad/sympy,sahilshekhawat/sympy,oliverlee/sympy,ChristinaZografou/sympy,kaushik94/sympy,emon10005/sympy,Titan-C/sympy,asm666/sympy,sampadsaha5/sympy,pandeyadarsh/sympy,MechCoder/sympy,Vishluck/sympy,Sumith1896/sympy,Mitchkoens/sympy,yashsharan/sympy,pbrady/sympy,toolforger/sympy,AunShiLord/sympy,jbbskinny/sympy,atreyv/sympy,Designist/sympy,AkademieOlympia/sympy,Mitchkoens/sympy,mafiya69/sympy,Gadal/sympy,cccfran/sympy,ChristinaZografou/sympy,lidavidm/sympy,bukzor/sympy,Gadal/sympy,shipci/sympy,aktech/sympy,emon10005/sympy,pandeyadarsh/sympy,farhaanbukhsh/sympy,atsao72/sympy,hargup/sympy,kumarkrishna/sympy,mafiya69/sympy,ChristinaZografou/sympy,vipulroxx/sympy,maniteja123/sympy,yashsharan/sympy,toolforger/sympy,wyom/sympy,wyom/sympy,kumarkrishna/sympy,jerli/sympy,saurabhjn76/sympy,kaushik94/sympy,jerli/sympy,farhaanbukhsh/sympy,madan96/sympy,hrashk/sympy,MechCoder/sympy,oliverlee/sympy,sampadsaha5/sympy,garvitr/sympy,meghana1995/sympy,drufat/sympy,mcdaniel67/sympy,cswiercz/sympy,sahmed95/sympy,jamesblunt/sympy,kevalds51/sympy,jaimahajan1997/sympy,hargup/sympy,kaushik94/sympy,vipulroxx/sympy,postvakje/sympy,kmacinnis/sympy,Mitchkoens/sympy