[whatwg/dom] Shadow: Update the definition of an unclosed node (#256)

Fixes https://github.com/w3c/webcomponents/issues/486.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/256

-- Commit Summary --

  * Shadow: Update the definition of an unclosed node

-- File Changes --

    M dom.bs (9)

-- Patch Links --

https://github.com/whatwg/dom/pull/256.patch
https://github.com/whatwg/dom/pull/256.diff

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