rewrite doctests for crv_stats - remove Lambda
rewrite doctests for crv_stats - remove Lambda

Instead of printing the result of density(X) (a lambda)
       we now print the result of density(X)(z)

This allows us to change the representation of density(X) without
failing tests

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