Fix doc on Mix.Shell.Process
Fix doc on Mix.Shell.Process

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