Missing documentation for `B` parameter on `Trigger`

[MrGVSV]

How can Bevy's documentation be improved?

The docs for Trigger don't really explain how the B type parameter should be used or what its for.

It would be nice to provide some documentation on how/when to use it.

[ogbird]

I'm seeing that the B: Bundle parameter is a clickable link that gives an overview of the Bundle trait. With the caveat that this is my first day in the code base, are we looking for some specific code examples in the Trigger documentation, or some like 'theory' type of discussion on the usage of the trait in the context of Trigger?

[MrGVSV]

I'm seeing that the B: Bundle parameter is a clickable link that gives an overview of the Bundle trait. With the caveat that this is my first day in the code base, are we looking for some specific code examples in the Trigger documentation, or some like 'theory' type of discussion on the usage of the trait in the context of Trigger?

I'm more looking for documentation on how to use the B parameter for the purpose of Trigger. The OnAdd/OnInsert/etc. observer events all make use of it, but it's not clear from the documentation on how to do that for custom observer events.

It should probably also indicate whether the supplied bundle is used with an or-ing (like commands) or and-ing (like queries) behavior.

[alice-i-cecile]

Duplicate of #14726.