[docs/release_guide.pod] slight tweaks
[docs/release_guide.pod] slight tweaks

The biggest improvement was probably that, since Parrot is now
git-based, PARROT_REVISION contains slightly diff'rent information.

skids/rakudo,salortiz/rakudo,Gnouc/rakudo,rjbs/rakudo,nunorc/rakudo,tony-o/deb-rakudodaily,laben/rakudo,jonathanstowe/rakudo,zhuomingliang/rakudo,LLFourn/rakudo,dwarring/rakudo,raydiak/rakudo,tony-o/deb-rakudodaily,labster/rakudo,LLFourn/rakudo,ungrim97/rakudo,MasterDuke17/rakudo,ungrim97/rakudo,samcv/rakudo,pmurias/rakudo,paultcochrane/rakudo,labster/rakudo,zhuomingliang/rakudo,cognominal/rakudo,jonathanstowe/rakudo,rakudo/rakudo,labster/rakudo,nbrown/rakudo,dankogai/rakudo,sjn/rakudo,salortiz/rakudo,laben/rakudo,softmoth/rakudo,salortiz/rakudo,niner/rakudo,teodozjan/rakudo,ugexe/rakudo,b2gills/rakudo,ab5tract/rakudo,pmurias/rakudo,Gnouc/rakudo,tbrowder/rakudo,usev6/rakudo,retupmoca/rakudo,zostay/rakudo,dwarring/rakudo,tony-o/rakudo,niner/rakudo,zostay/rakudo,softmoth/rakudo,cognominal/rakudo,salortiz/rakudo,lucasbuchala/rakudo,skids/rakudo,awwaiid/rakudo,dwarring/rakudo,cygx/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,ugexe/rakudo,tony-o/deb-rakudodaily,nunorc/rakudo,rakudo/rakudo,cognominal/rakudo,usev6/rakudo,rakudo/rakudo,tbrowder/rakudo,pmurias/rakudo,salortiz/rakudo,dankogai/rakudo,paultcochrane/rakudo,awwaiid/rakudo,dankogai/rakudo,samcv/rakudo,lucasbuchala/rakudo,rakudo/rakudo,tbrowder/rakudo,softmoth/rakudo,tbrowder/rakudo,retupmoca/rakudo,ungrim97/rakudo,tbrowder/rakudo,Gnouc/rakudo,awwaiid/rakudo,tony-o/deb-rakudodaily,labster/rakudo,Leont/rakudo,jonathanstowe/rakudo,teodozjan/rakudo,sergot/rakudo,teodozjan/rakudo,skids/rakudo,ugexe/rakudo,jonathanstowe/rakudo,tony-o/deb-rakudodaily,retupmoca/rakudo,azawawi/rakudo,salortiz/rakudo,Gnouc/rakudo,nbrown/rakudo,Leont/rakudo,cygx/rakudo,azawawi/rakudo,sergot/rakudo,skids/rakudo,tony-o/rakudo,dwarring/rakudo,ugexe/rakudo,raydiak/rakudo,cygx/rakudo,LLFourn/rakudo,retupmoca/rakudo,rakudo/rakudo,niner/rakudo,azawawi/rakudo,tony-o/rakudo,nbrown/rakudo,ab5tract/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,b2gills/rakudo,zhuomingliang/rakudo,tony-o/deb-rakudodaily,ab5tract/rakudo,usev6/rakudo,paultcochrane/rakudo,samcv/rakudo,b2gills/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,laben/rakudo,MasterDuke17/rakudo,labster/rakudo,pmurias/rakudo,azawawi/rakudo,ugexe/rakudo,nbrown/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,sergot/rakudo,laben/rakudo,rakudo/rakudo,niner/rakudo,ab5tract/rakudo,sjn/rakudo,dankogai/rakudo,nunorc/rakudo,LLFourn/rakudo,nunorc/rakudo,samcv/rakudo,cygx/rakudo,nbrown/rakudo,sergot/rakudo,sjn/rakudo,tony-o/rakudo,raydiak/rakudo,Gnouc/rakudo,lucasbuchala/rakudo,azawawi/rakudo,ungrim97/rakudo,softmoth/rakudo,Gnouc/rakudo,paultcochrane/rakudo,rjbs/rakudo,cognominal/rakudo,samcv/rakudo,LLFourn/rakudo,b2gills/rakudo,sjn/rakudo,skids/rakudo,teodozjan/rakudo,rjbs/rakudo,zostay/rakudo,sjn/rakudo,Leont/rakudo,usev6/rakudo,labster/rakudo,paultcochrane/rakudo,zhuomingliang/rakudo,zostay/rakudo,awwaiid/rakudo,tony-o/deb-rakudodaily,usev6/rakudo,ungrim97/rakudo,b2gills/rakudo,cognominal/rakudo,cygx/rakudo,dankogai/rakudo,tony-o/rakudo,raydiak/rakudo,softmoth/rakudo,tony-o/rakudo,Leont/rakudo,nbrown/rakudo