Fix mention to double-underscore forms in Naming Conventions (#6199)
Fix mention to double-underscore forms in Naming Conventions (#6199)

And sort them alphabetically.
ggcampinho/elixir,antipax/elixir,gfvcastro/elixir,elixir-lang/elixir,pedrosnk/elixir,kimshrier/elixir,joshprice/elixir,ggcampinho/elixir,pedrosnk/elixir,kelvinst/elixir,lexmag/elixir,antipax/elixir,kimshrier/elixir,beedub/elixir,michalmuskala/elixir,lexmag/elixir,beedub/elixir,kelvinst/elixir,gfvcastro/elixir