message: Update built-in help for features
  Fixed
diff: @@ -117,7 +117,7 @@ pub trait AppExt: Sized {
  self._arg(multi_opt(
  "features",
  "FEATURES",
  - "Space-separated list of features to activate",
  + "Space or comma separated list of features to activate",
  ))
  ._arg(opt("all-features", "Activate all available features"))
  ._arg(opt(
  