Update Port ### spawn example (#6630)
Update Port ### spawn example (#6630)

The explanation used `echo hello` so it would make sense for the example to use the same.
ggcampinho/elixir,antipax/elixir,kelvinst/elixir,beedub/elixir,elixir-lang/elixir,joshprice/elixir,beedub/elixir,antipax/elixir,pedrosnk/elixir,kelvinst/elixir,michalmuskala/elixir,pedrosnk/elixir,kimshrier/elixir,gfvcastro/elixir,lexmag/elixir,kimshrier/elixir,ggcampinho/elixir,lexmag/elixir,gfvcastro/elixir