Fix small typos in release notes
Fix small typos in release notes

Build-in → built-in
marciojcoelho/riotjs,mike-ward/riot,thepian/riot,ListnPlay/riotjs,crisward/riot,antonheryanto/riot,mike-ward/riot,daemonchen/riotjs,muut/riotjs,noodle-learns-programming/riot,ttamminen/riotjs,xieyu33333/riot,noodle-learns-programming/riot,davidmarkclements/riot,GerHobbelt/riotjs,txchen/riotjs,beni55/riot,madlordory/riot,thepian/riot,zawsx/js-lib-webcomponents-react-riot,dschnare/riot,chetanism/riot,sylvainpolletvillard/riot,marciojcoelho/riotjs,rsbondi/riotjs,cognitom/riotjs,crisward/riot,stonexer/riot,baysao/riot,muut/riotjs,scalabl3/riot,stonexer/riot,GerHobbelt/riotjs,qrb/riotjs,madlordory/riot,ListnPlay/riotjs,a-moses/riot,rasata/riot,antonheryanto/riot,scalabl3/riot,seedtigo/riot,AndrewSwerlick/riot,xieyu33333/riot,duongphuhiep/riot,joshcartme/riot,marcioj/riot,marcioj/riot,xtity/riot,sylvainpolletvillard/riot,rthbound/riot,zawsx/js-lib-webcomponents-react-riot,rasata/riot,qrb/riotjs,laomu1988/riot,joshcartme/riot,dschnare/riot,rsbondi/riotjs,beni55/riot,duongphuhiep/riot,laomu1988/riot,daemonchen/riotjs,davidmarkclements/riot,dp-lewis/riot,seedtigo/riot,ttamminen/riotjs,baysao/riot,tao-zeng/riot,txchen/riotjs,dp-lewis/riot,a-moses/riot,tao-zeng/riot,chetanism/riot,xtity/riot,AndrewSwerlick/riot,rthbound/riot