add IE8 how-to link to faq
add IE8 how-to link to faq

come to prevent similar issues about IE8 in the future

 #928 solution
thepian/riot,noodle-learns-programming/riot,baysao/riot,txchen/riotjs,duongphuhiep/riot,qrb/riotjs,rthbound/riot,txchen/riotjs,dschnare/riot,dp-lewis/riot,seedtigo/riot,tao-zeng/riot,rasata/riot,beni55/riot,noodle-learns-programming/riot,daemonchen/riotjs,thepian/riot,marcioj/riot,sylvainpolletvillard/riot,laomu1988/riot,joshcartme/riot,crisward/riot,rasata/riot,stonexer/riot,daemonchen/riotjs,laomu1988/riot,muut/riotjs,xtity/riot,AndrewSwerlick/riot,muut/riotjs,zawsx/js-lib-webcomponents-react-riot,chetanism/riot,dschnare/riot,dp-lewis/riot,scalabl3/riot,davidmarkclements/riot,chetanism/riot,sylvainpolletvillard/riot,marcioj/riot,xtity/riot,crisward/riot,stonexer/riot,rthbound/riot,scalabl3/riot,duongphuhiep/riot,madlordory/riot,tao-zeng/riot,seedtigo/riot,davidmarkclements/riot,zawsx/js-lib-webcomponents-react-riot,beni55/riot,madlordory/riot,qrb/riotjs,AndrewSwerlick/riot,joshcartme/riot,baysao/riot