Document version of :start/:stop events (tracers) (#9871)
Document version of :start/:stop events (tracers) (#9871)


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