[whatwg/dom] Be clearer that not all aborting ends with an "AbortError" DOMException (#961)

I saw a thread on Twitter between @LeaVerou and @jyasskin that highlighted the current text only addresses APIs yielding promises. I'm not sure there is precedent for event-based APIs, where we might want to dispatch an `abort` event or some such, but we could at least discuss `addEventListener()`, which effectively silently removes listeners.

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