Document how propagate(false) works

[viridia]

How can Bevy's documentation be improved?

In the docs for propagate, please explain that when propagation is stopped, observers will continue to trigger for that target entity, and only the observers for ancestor entities are affected. This is true for both per-entity and global observers.

Something like this:

Calling propagate(false) from within an observer callback will prevent the event from triggering along the chain of related entities, but will not inhibit the triggering of other observers on the same entity. This is true for both global and per-entity observers: once an observer is triggered for a given target entity, all matching observers will be triggered for that target, although the order of firing is unspecified.