[whatwg/dom] Add part attribute and note that part and exportparts are superglobal (PR #1372)

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`part` and `exportparts` were the (I hope) only two attributes that I missed in https://github.com/wlib/html-info due to them not appearing in [the spec](https://dom.spec.whatwg.org/#:~:text=id%2C%20class%2C%20and%20slot%20are%20effectively%20superglobal,.). There was [an issue](https://github.com/w3c/csswg-drafts/issues/3424) filed in 2018 asking to add `part` as a superglobal attribute to the DOM spec. This PR also notes that `exportparts` is a superglobal attribute, but does not make any references to its functionality. I want to ask whether this PR is desirable in the first place because other attributes like those defined in ARIA (e.g. `role` and `aria-label`) also are superglobal with corresponding IDL attributes defined on `Element`. I think that having a table that indexes all of the attributes in one place would be desirable, but it's unclear which spec such an index should live in.

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  https://github.com/whatwg/dom/pull/1372

-- Commit Summary --

  * Add part attribute and note that part and exportparts are superglobal

-- File Changes --

    M dom.bs (17)

-- Patch Links --

https://github.com/whatwg/dom/pull/1372.patch
https://github.com/whatwg/dom/pull/1372.diff

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