Improve documentation of File.open* functions (#5398)
Improve documentation of File.open* functions (#5398)


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