describe the usage of the RegisterListenersPass
feature #3950 [Components][EventDispatcher] describe the usage of the RegisterListenersPass (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

[Components][EventDispatcher] describe the usage of the RegisterListenersPass

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | all
| Fixed tickets | #3879

Commits
-------

36407e0 describe the usage of the RegisterListenersPass