Improve compile.protocols docs and make it public
Improve compile.protocols docs and make it public

kimshrier/elixir,beedub/elixir,pedrosnk/elixir,pedrosnk/elixir,gfvcastro/elixir,kelvinst/elixir,ggcampinho/elixir,lexmag/elixir,ggcampinho/elixir,kimshrier/elixir,lexmag/elixir,elixir-lang/elixir,antipax/elixir,beedub/elixir,kelvinst/elixir,gfvcastro/elixir,joshprice/elixir,michalmuskala/elixir,antipax/elixir