[whatwg/dom] Document more event dispatch quirks (#687)

Everything is terrible:

* disabled form controls are special: https://github.com/whatwg/html/issues/2368 (Chrome is attempting to remove this, but is alone thus far and it's not enabled by default; it's also a little unclear at what layer this needs to be specified, but some browsers implement it as part of dispatch)
* submit/reset events on `form` elements need to be handled in a special way: https://github.com/whatwg/html/issues/3599

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