[9.x] Update releases.md related to event:list command

[imanghafoori1]

Related PRs:

• [9.x] Tweak event:list command framework#35037
• [9.x] Remove extra code from event list command framework#35221
• [9.x] Fix event:list command framework#40528

[taylorotwell]

I don't think the visual aspect of this command changed? Just some minor fixes?

[imanghafoori1]

@taylorotwell Can not be considered as a minor fix, since it solves the good old problem of the "pub/sub" pattern which says that you can not easily find listeners of an event since they can lurk anywhere.

I think event:list was totally forgotten since it was brining little value. it was just showing just a portion of what was hard-coded in the EventServiceProvider.
And without documentation, no one starts to use it again.