remove incorrect part of channel docs example (#2593)
remove incorrect part of channel docs example (#2593)


gjaldon/phoenix,mschae/phoenix,phoenixframework/phoenix,bsmr-erlang/phoenix,Joe-noh/phoenix,korobkov/phoenix,0x00evil/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,trarbr/phoenix,Kosmas/phoenix,nshafer/phoenix,Gazler/phoenix,optikfluffel/phoenix,optikfluffel/phoenix,0x00evil/phoenix,trarbr/phoenix,mobileoverlord/phoenix,korobkov/phoenix,eksperimental/phoenix,mschae/phoenix,stevedomin/phoenix,dmarkow/phoenix,mitchellhenke/phoenix,pap/phoenix,eksperimental/phoenix,Joe-noh/phoenix,phoenixframework/phoenix,rafbgarcia/phoenix,keathley/phoenix,evax/phoenix,Kosmas/phoenix,jwarwick/phoenix,michalmuskala/phoenix,keathley/phoenix,dmarkow/phoenix,jwarwick/phoenix,rafbgarcia/phoenix,Gazler/phoenix,evax/phoenix,phoenixframework/phoenix,michalmuskala/phoenix,stevedomin/phoenix,optikfluffel/phoenix,pap/phoenix,bsmr-erlang/phoenix,gjaldon/phoenix,nshafer/phoenix,mitchellhenke/phoenix,nshafer/phoenix,mobileoverlord/phoenix