fix(doc): Putting a little emphasis on email first (#584) r=@shane-tomlinson
fix(doc): Putting a little emphasis on email first (#584) r=@shane-tomlinson

I was going to link to this page and I realized we didn't put any emphasis on email first flow so I thought I would add that. I believe we all want to make it clear that it is the new preferred method for authenticating users.
mozilla/fxa-auth-server,mozilla/fxa-auth-server,mozilla/fxa-auth-server,mozilla/fxa-auth-server