message: Update `Dialer` docs
diff: @@ -145,12 +145,11 @@ pub(crate) trait Dialer {
  /// Attempt to connect to the outgoing socket address.
  ///
  - /// For every time this function is called by `OutgoingManager`, there eventually *must* be a
  - /// corresponding call to `handle_dial_outcome`.
  + /// For every time this function is called, there must be a corresponding call to
  + /// `handle_dial_outcome` eventually.
  ///
  - /// `OutgoingManager` guarantees that there will never be another `connect_outgoing` call for
  - /// the same `addr` before the most recent one has been been answered using
  - /// `handle_dial_outcome`.
  + /// The caller is responsible for ensuring that there is always only one `connect_outgoing` call
  + /// that has not been answered by `handle_dial_outcome` for every `addr`.
  ///
  /// Any logging of connection issues should be done in the context of `span` for better log
  /// output.
  