Add section about function arguments to 'Writing Documentation'
Add section about function arguments to 'Writing Documentation'

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