6c426308f0
Related to: https://github.com/spring-projects/spring-integration/issues/9683. Since we are going to restore `controlBus()` for convenience, and only one way of Control Bus pattern, based on the `ControlBusCommandRegistry`, there is no need to have another `controlBusOnRegistry()` method * Also fix link for `error-handling` chapter from the `special-channels.adoc`