Add a note about tasks running once, closes #10712
Add a note about tasks running once, closes #10712

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