[whatwg/dom] Remove additions from the historical section (#592)

And perform some minor cleanup elsewhere.

Fixes #394.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/592

-- Commit Summary --

  * Remove additions from the historical section

-- File Changes --

    M dom.bs (154)

-- Patch Links --

https://github.com/whatwg/dom/pull/592.patch
https://github.com/whatwg/dom/pull/592.diff

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