Reformat the Basic.rewrite docstring
Reformat the Basic.rewrite docstring

Better indentation and additional explanatory doctests.

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