Added missing commas in Application.get_env/3 examples [skip ci] (#7939)
Added missing commas in Application.get_env/3 examples [skip ci] (#7939)


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