Update `gym build` description (#8541)
Update `gym build` description (#8541)

`Just build` was used in the very early fastlane days, not any more
taquitos/fastlane,rimarsh/fastlane,ExtremeMan/fastlane,bolom/fastlane,Econa77/fastlane,ffittschen/fastlane,tommeier/fastlane,icecrystal23/fastlane,keatongreve/fastlane,adellibovi/fastlane,bassrock/fastlane,Fanagame/fastlane,keatongreve/fastlane,taquitos/fastlane,taquitos/fastlane,nafu/fastlane,javibm/fastlane,vronin/fastlane,enozero/fastlane,brbulic/fastlane,tmtrademarked/fastlane,danielbowden/fastlane,tmtrademarked/fastlane,adamcohenrose/fastlane,keatongreve/fastlane,sinoru/fastlane,allewun/fastlane,rimarsh/fastlane,ffittschen/fastlane,Fanagame/fastlane,fulldecent/fastlane,keatongreve/fastlane,keatongreve/fastlane,mgrebenets/fastlane,dral3x/fastlane,jaleksynas/fastlane,Econa77/fastlane,vronin/fastlane,soxjke/fastlane,keatongreve/fastlane,cpk1/fastlane,marcelofabri/fastlane,kazuhidet/fastlane,adamcohenrose/fastlane,powtac/fastlane,rimarsh/fastlane,thasegaw/fastlane,danielbowden/fastlane,dral3x/fastlane,powtac/fastlane,jaleksynas/fastlane,kazuhidet/fastlane,icecrystal23/fastlane,rimarsh/fastlane,SemenovAlexander/fastlane,jaleksynas/fastlane,cpk1/fastlane,ashfurrow/fastlane,farkasseb/fastlane,farkasseb/fastlane,joshdholtz/fastlane,hjanuschka/fastlane,powtac/fastlane,bolom/fastlane,SiarheiFedartsou/fastlane,joshdholtz/fastlane,thasegaw/fastlane,adellibovi/fastlane,lacostej/fastlane,KrauseFx/fastlane,hjanuschka/fastlane,manuyavuz/fastlane,cpk1/fastlane,mbogh/fastlane,joshdholtz/fastlane,brbulic/fastlane,vronin/fastlane,powtac/fastlane,marcelofabri/fastlane,NicholasFFox/fastlane,tmtrademarked/fastlane,tommeier/fastlane,enozero/fastlane,KrauseFx/fastlane,cpk1/fastlane,mathiasAichinger/fastlane,luongm/fastlane,sinoru/fastlane,mathiasAichinger/fastlane,matthewellis/fastlane,mathiasAichinger/fastlane,keatongreve/fastlane,SiarheiFedartsou/fastlane,rimarsh/fastlane,mathiasAichinger/fastlane,daveanderson/fastlane,orta/fastlane,mgrebenets/fastlane,bolom/fastlane,Econa77/fastlane,SiarheiFedartsou/fastlane,mgrebenets/fastlane,daveanderson/fastlane,vronin/fastlane,SemenovAlexander/fastlane,ashfurrow/fastlane,soxjke/fastlane,lacostej/fastlane,manuyavuz/fastlane,manuyavuz/fastlane,NicholasFFox/fastlane,adellibovi/fastlane,mbogh/fastlane,SemenovAlexander/fastlane,vronin/fastlane,ffittschen/fastlane,thasegaw/fastlane,thasegaw/fastlane,matthewellis/fastlane,Fanagame/fastlane,tommeier/fastlane,mgrebenets/fastlane,hjanuschka/fastlane,matthewellis/fastlane,SiarheiFedartsou/fastlane,icecrystal23/fastlane,adamcohenrose/fastlane,vronin/fastlane,marcelofabri/fastlane,joshdholtz/fastlane,dral3x/fastlane,manuyavuz/fastlane,ExtremeMan/fastlane,bassrock/fastlane,fastlane/fastlane,marcelofabri/fastlane,farkasseb/fastlane,kazuhidet/fastlane,mbogh/fastlane,javibm/fastlane,bassrock/fastlane,ExtremeMan/fastlane,cpk1/fastlane,nafu/fastlane,icecrystal23/fastlane,adellibovi/fastlane,fastlane/fastlane,nafu/fastlane,kazuhidet/fastlane,revile/fastlane,NicholasFFox/fastlane,joshdholtz/fastlane,tommeier/fastlane,danielbowden/fastlane,daveanderson/fastlane,ExtremeMan/fastlane,adamcohenrose/fastlane,adamcohenrose/fastlane,ashfurrow/fastlane,lacostej/fastlane,allewun/fastlane,sinoru/fastlane,nafu/fastlane,javibm/fastlane,revile/fastlane,dral3x/fastlane,KrauseFx/fastlane,ffittschen/fastlane,marcelofabri/fastlane,jaleksynas/fastlane,danielbowden/fastlane,NicholasFFox/fastlane,Econa77/fastlane,SemenovAlexander/fastlane,luongm/fastlane,ashfurrow/fastlane,nafu/fastlane,mathiasAichinger/fastlane,KrauseFx/fastlane,marcelofabri/fastlane,tmtrademarked/fastlane,icecrystal23/fastlane,matthewellis/fastlane,matthewellis/fastlane,ffittschen/fastlane,revile/fastlane,bassrock/fastlane,mbogh/fastlane,tmtrademarked/fastlane,Fanagame/fastlane,brbulic/fastlane,hjanuschka/fastlane,luongm/fastlane,luongm/fastlane,powtac/fastlane,icecrystal23/fastlane,mgrebenets/fastlane,taquitos/fastlane,Fanagame/fastlane,ExtremeMan/fastlane,enozero/fastlane,fastlane/fastlane,rimarsh/fastlane,daveanderson/fastlane,sinoru/fastlane,fulldecent/fastlane,thasegaw/fastlane,javibm/fastlane,revile/fastlane,luongm/fastlane,hjanuschka/fastlane,hjanuschka/fastlane,javibm/fastlane,KrauseFx/fastlane,mbogh/fastlane,sinoru/fastlane,adellibovi/fastlane,tommeier/fastlane,danielbowden/fastlane,marcelofabri/fastlane,NicholasFFox/fastlane,lacostej/fastlane,manuyavuz/fastlane,dral3x/fastlane,allewun/fastlane,SiarheiFedartsou/fastlane,fulldecent/fastlane,NicholasFFox/fastlane,dral3x/fastlane,fulldecent/fastlane,mathiasAichinger/fastlane,Econa77/fastlane,soxjke/fastlane,soxjke/fastlane,kohtenko/fastlane,farkasseb/fastlane,ExtremeMan/fastlane,revile/fastlane,allewun/fastlane,Fanagame/fastlane,ashfurrow/fastlane,matthewellis/fastlane,allewun/fastlane,joshdholtz/fastlane,jaleksynas/fastlane,ffittschen/fastlane,daveanderson/fastlane,lacostej/fastlane,tmtrademarked/fastlane,NicholasFFox/fastlane,SiarheiFedartsou/fastlane,revile/fastlane,javibm/fastlane,fastlane/fastlane,daveanderson/fastlane,kohtenko/fastlane,brbulic/fastlane,fastlane/fastlane,bassrock/fastlane,taquitos/fastlane,javibm/fastlane,powtac/fastlane,soxjke/fastlane,nafu/fastlane,ffittschen/fastlane,mgrebenets/fastlane,ashfurrow/fastlane,allewun/fastlane,mbogh/fastlane,brbulic/fastlane,KrauseFx/fastlane,Econa77/fastlane,ashfurrow/fastlane,jaleksynas/fastlane,cpk1/fastlane,SemenovAlexander/fastlane,bolom/fastlane,Fanagame/fastlane,manuyavuz/fastlane,dral3x/fastlane,Econa77/fastlane,ExtremeMan/fastlane,bolom/fastlane,jaleksynas/fastlane,taquitos/fastlane,luongm/fastlane,joshdholtz/fastlane,brbulic/fastlane,sinoru/fastlane,vronin/fastlane,SiarheiFedartsou/fastlane,enozero/fastlane,mbogh/fastlane,sinoru/fastlane,manuyavuz/fastlane,powtac/fastlane,tommeier/fastlane,enozero/fastlane,adamcohenrose/fastlane,adamcohenrose/fastlane,cpk1/fastlane,fulldecent/fastlane,danielbowden/fastlane,tommeier/fastlane,orta/fastlane,thasegaw/fastlane,kazuhidet/fastlane,revile/fastlane,nafu/fastlane,adellibovi/fastlane,enozero/fastlane,farkasseb/fastlane,allewun/fastlane,soxjke/fastlane,SemenovAlexander/fastlane,daveanderson/fastlane,adellibovi/fastlane,enozero/fastlane,tmtrademarked/fastlane,kazuhidet/fastlane,farkasseb/fastlane,thasegaw/fastlane,SemenovAlexander/fastlane,fastlane/fastlane,lacostej/fastlane,taquitos/fastlane,matthewellis/fastlane,mgrebenets/fastlane,luongm/fastlane,rimarsh/fastlane,kazuhidet/fastlane,bassrock/fastlane,brbulic/fastlane,fulldecent/fastlane,hjanuschka/fastlane,KrauseFx/fastlane,mathiasAichinger/fastlane,soxjke/fastlane,fulldecent/fastlane,bolom/fastlane,danielbowden/fastlane,bolom/fastlane,farkasseb/fastlane