[whatwg/dom] Document AbortController removal and some improvements (Issue #1449)

marcoscaceres created an issue (whatwg/dom#1449)

### What is the issue with the DOM Standard?

The [Using AbortController and AbortSignal objects in APIs](https://dom.spec.whatwg.org/#abortcontroller-api-integration) section lacks an example of how to remove the algorithm (and why, particularly as it relates to controlling browser UIs like a credential chooser). This came up in https://github.com/w3c-fedid/digital-credentials/pull/463, where one needs to hold a reference to the algorithm to later remove it. 

Also noting that [WebAuth cites this section of the specification](https://www.w3.org/TR/webauthn-2/#sctn-abortoperation), then goes onto do things incorrectly (I think it never adds or removes the algorithm, and it doesn't use the abort reason)... so we might need to clarify things a bit more about how to spec things properly. 

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