Update docs with new hex install
Update docs with new hex install

jwarwick/phoenix,rafbgarcia/phoenix,0x00evil/phoenix,phoenixframework/phoenix,0x00evil/phoenix,nshafer/phoenix,eksperimental/phoenix,Gazler/phoenix,Kosmas/phoenix,nshafer/phoenix,Kosmas/phoenix,jwarwick/phoenix,optikfluffel/phoenix,michalmuskala/phoenix,evax/phoenix,0x00evil/phoenix,michalmuskala/phoenix,optikfluffel/phoenix,phoenixframework/phoenix,dmarkow/phoenix,mitchellhenke/phoenix,phoenixframework/phoenix,nshafer/phoenix,eksperimental/phoenix,rafbgarcia/phoenix,Joe-noh/phoenix,rafbgarcia/phoenix,Gazler/phoenix,mitchellhenke/phoenix,dmarkow/phoenix,evax/phoenix,keathley/phoenix,Joe-noh/phoenix,keathley/phoenix,optikfluffel/phoenix