utilities/randtest: Fix sphinx errors in doctest
utilities/randtest: Fix sphinx errors in doctest

The docstring of comp() used |z1| to indicate the absolute value of z1,
which confused Sphinx where |z1| is the syntax for substitutions. Wrap
the strings with backquotes (`) to fix this.

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