Correct docstring of Pow for 0**negative; few formatting fixes
Correct docstring of Pow for 0**negative; few formatting fixes

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