combinatorics/permutations: Corrected docstrings.
combinatorics/permutations: Corrected docstrings.

Signed-off-by: Saptarshi Mandal <13ec3c7bab52575f3a0cda6406c76269cc13b041@gmail.com>

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