[w3c/DOM-Parsing] insertAdjacentHTML should return a NodeList (#63)

`insertAdjacentElement()` returns the resulting element, yet `insertAdjacentHTML()` doesn't have a return value. In my mind it should return a NodeList if successful. Has this been discussed in the past?

Having a return (NodeList or otherwise) removes the need to do a `querySelector`/`querySelectorAll`/`getElementByID` after insertion - making it cleaner to use.

It makes more sense to me than the `insertAdjacentElement()` use case, where you already have a pre-existing reference to the attached element - however `insertAdjacentHTML()`  starts from scratch, necessitating the lookup after insertion if you want to reference it later.

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https://github.com/w3c/DOM-Parsing/issues/63