message: Documentation nitpicks
diff: @@ -647,8 +647,9 @@ public:
  return run_scheduled(time_point_cast<duration_t>(when), make_action(what));
  }
  - /// Runs `what` asynchronously at some point after `when`, iff this actor is
  - /// alive.
  + /// Runs `what` asynchronously at some point after `when` if the actor still
  + /// exists. The callback is going to hold a weak reference to the actor, i.e.,
  + /// does not prevent the actor to become unreachable.
  /// @param when The local time until the actor waits before invoking the
  /// action. Due to scheduling delays, there will always be some
  /// additional wait time. Passing the current time or a past time
  @@ -685,7 +686,9 @@ public:
  return run_delayed(duration_cast<timespan>(delay), make_action(what));
  }
  - /// Runs `what` asynchronously after the `delay`, iff this actor is alive.
  + /// Runs `what` asynchronously after the `delay` if the actor still exists.
  + /// The callback is going to hold a weak reference to the actor, i.e., does
  + /// not prevent the actor to become unreachable.
  /// @param delay Minimum amount of time that actor waits before invoking the
  /// action. Due to scheduling delays, there will always be some
  /// additional wait time.
  