Fix a typo in the conn() deprecation notice; improve the build_conn() typespecs
Fix a typo in the conn() deprecation notice; improve the build_conn() typespecs

nshafer/phoenix,Joe-noh/phoenix,CultivateHQ/phoenix,ybur-yug/phoenix,evax/phoenix,0x00evil/phoenix,bsmr-erlang/phoenix,dmarkow/phoenix,optikfluffel/phoenix,mitchellhenke/phoenix,mitchellhenke/phoenix,jamilabreu/phoenix,michalmuskala/phoenix,iStefo/phoenix,Gazler/phoenix,optikfluffel/phoenix,ephe-meral/phoenix,rafbgarcia/phoenix,phoenixframework/phoenix,rafbgarcia/phoenix,ephe-meral/phoenix,gjaldon/phoenix,0x00evil/phoenix,0x00evil/phoenix,iStefo/phoenix,wsmoak/phoenix,eksperimental/phoenix,cas27/phoenix,nshafer/phoenix,dmarkow/phoenix,jwarwick/phoenix,CultivateHQ/phoenix,Gazler/phoenix,keathley/phoenix,trarbr/phoenix,Kosmas/phoenix,trarbr/phoenix,gjaldon/phoenix,ybur-yug/phoenix,cas27/phoenix,michalmuskala/phoenix,eksperimental/phoenix,bsmr-erlang/phoenix,stevedomin/phoenix,jamilabreu/phoenix,ericmj/phoenix,Ben-Evolently/phoenix,rafbgarcia/phoenix,Joe-noh/phoenix,korobkov/phoenix,korobkov/phoenix,Kosmas/phoenix,nshafer/phoenix,phoenixframework/phoenix,mschae/phoenix,ericmj/phoenix,mobileoverlord/phoenix,jwarwick/phoenix,pap/phoenix,pap/phoenix,wsmoak/phoenix,mschae/phoenix,evax/phoenix,phoenixframework/phoenix,keathley/phoenix,stevedomin/phoenix,mobileoverlord/phoenix,optikfluffel/phoenix