minpoly: update documentation
minpoly: update documentation

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