Link to docs for `new_email/1` in SMTP guide (#635)
Link to docs for `new_email/1` in SMTP guide (#635)

Helps to clarify potential confusion, e.g. #634.
nshafer/phoenix,pap/phoenix,trarbr/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,dmarkow/phoenix,evax/phoenix,michalmuskala/phoenix,pap/phoenix,mobileoverlord/phoenix,nshafer/phoenix,dmarkow/phoenix,eksperimental/phoenix,michalmuskala/phoenix,Kosmas/phoenix,0x00evil/phoenix,Kosmas/phoenix,bratsche/phoenix_guides,korobkov/phoenix,Joe-noh/phoenix,korobkov/phoenix,optikfluffel/phoenix,gjaldon/phoenix,0x00evil/phoenix,stevedomin/phoenix,evax/phoenix,nshafer/phoenix,mschae/phoenix,phoenixframework/phoenix,Gazler/phoenix,Gazler/phoenix,phoenixframework/phoenix,eksperimental/phoenix,mobileoverlord/phoenix,bsmr-erlang/phoenix,trarbr/phoenix,mitchellhenke/phoenix,jwarwick/phoenix,phoenixframework/phoenix,rafbgarcia/phoenix,jwarwick/phoenix,Joe-noh/phoenix,gjaldon/phoenix,mschae/phoenix,rafbgarcia/phoenix,bsmr-erlang/phoenix,optikfluffel/phoenix,keathley/phoenix,keathley/phoenix,mitchellhenke/phoenix,optikfluffel/phoenix,stevedomin/phoenix