Add make cheatsheet to the doc Makefile
Add make cheatsheet to the doc Makefile

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