[whatwg/dom] Mark ATTRIBUTE_NODE and SHOW_ATTRIBUTE as no longer historical (#321)

Follow-up to #102.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/321

-- Commit Summary --

  * Mark ATTRIBUTE_NODE and SHOW_ATTRIBUTE as no longer historical

-- File Changes --

    M dom.bs (4)
    M dom.html (8)

-- Patch Links --

https://github.com/whatwg/dom/pull/321.patch
https://github.com/whatwg/dom/pull/321.diff

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