Improve IO docs
Improve IO docs

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