Fix make docs.
Fix make docs.

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