Re: [whatwg/dom] Add more explanation for Event concepts (#863)

I would add the note about isTrusted [here](https://dom.spec.whatwg.org/#dom-event-istrusted) and the note about passive [here](https://dom.spec.whatwg.org/#ref-for-event-listener-passive%E2%91%A0) or [here](https://dom.spec.whatwg.org/#event-listener-passive) because that's where it would have helped me.

Thanks again, I tried doing a nice thing (making a comparison to [help](https://github.com/openjs-foundation/summit/issues/273) Node.js) and ended up learning things I thought I already knew but didn't :] So I am very happy with both your help today and I think it would be useful to add these notes to the spec.

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