[whatwg/dom] Meta: use new WHATWG boilerplate and license (#553)

Also fixes a markup issue and linking error.

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Do not merge until https://github.com/tabatkins/bikeshed/pull/1155 is merged.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/553

-- Commit Summary --

  * Meta: use new WHATWG boilerplate and license

-- File Changes --

    M LICENSE (511)
    M dom.bs (57)

-- Patch Links --

https://github.com/whatwg/dom/pull/553.patch
https://github.com/whatwg/dom/pull/553.diff

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https://github.com/whatwg/dom/pull/553