Docstring for Expr
Docstring for Expr

fixes #4985

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