Fix failing doctests in ringseries.rst
Fix failing doctests in ringseries.rst

skidzo/sympy,souravsingh/sympy,rahuldan/sympy,mcdaniel67/sympy,oliverlee/sympy,Shaswat27/sympy,rahuldan/sympy,Davidjohnwilson/sympy,kaichogami/sympy,ga7g08/sympy,hargup/sympy,oliverlee/sympy,souravsingh/sympy,maniteja123/sympy,ga7g08/sympy,yashsharan/sympy,jaimahajan1997/sympy,Shaswat27/sympy,aktech/sympy,drufat/sympy,chaffra/sympy,sampadsaha5/sympy,Davidjohnwilson/sympy,wanglongqi/sympy,ahhda/sympy,drufat/sympy,jaimahajan1997/sympy,chaffra/sympy,Curious72/sympy,kevalds51/sympy,postvakje/sympy,jerli/sympy,lindsayad/sympy,postvakje/sympy,Arafatk/sympy,mafiya69/sympy,Titan-C/sympy,souravsingh/sympy,Curious72/sympy,yashsharan/sympy,jerli/sympy,oliverlee/sympy,MechCoder/sympy,mcdaniel67/sympy,ga7g08/sympy,sampadsaha5/sympy,wanglongqi/sympy,Arafatk/sympy,Davidjohnwilson/sympy,Titan-C/sympy,Curious72/sympy,madan96/sympy,madan96/sympy,kaushik94/sympy,aktech/sympy,kaushik94/sympy,mcdaniel67/sympy,maniteja123/sympy,Arafatk/sympy,skidzo/sympy,lindsayad/sympy,ahhda/sympy,jaimahajan1997/sympy,drufat/sympy,maniteja123/sympy,MechCoder/sympy,kaichogami/sympy,hargup/sympy,chaffra/sympy,rahuldan/sympy,kevalds51/sympy,ChristinaZografou/sympy,postvakje/sympy,ChristinaZografou/sympy,Shaswat27/sympy,mafiya69/sympy,Titan-C/sympy,wanglongqi/sympy,kaichogami/sympy,ChristinaZografou/sympy,kaushik94/sympy,ahhda/sympy,yashsharan/sympy,jerli/sympy,madan96/sympy,lindsayad/sympy,MechCoder/sympy,skidzo/sympy,sampadsaha5/sympy,kevalds51/sympy,mafiya69/sympy,aktech/sympy,hargup/sympy