Document Elixir syntax rules, closes #6026
Document Elixir syntax rules, closes #6026

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