[whatwg/dom] removing multiple attributes at once with removeAttribute(...n) (#932)

Like with `classList` you can remove multiple classes with `classList.remove(token1[, token2[, ...tokenN]])`
was thinking maybe we could have the same thing for removing attributes `node.removeAttribute('src', 'alt')`

instead of having to do: 
```js
image.removeAttribute('src');
image.removeAttribute('alt');
```

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