piecewise: Fix doctests
piecewise: Fix doctests

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