Fix typo in `make help`.
Fix typo in `make help`.

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