Improve docstrings for Predicate and AppliedPredicate.
Improve docstrings for Predicate and AppliedPredicate.

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