[whatwg/dom] Insertion of empty DocumentFragment is a no-op (#806)

Also clean up the language around DocumentFragment nodes in this algorithm a bit.

Tests: https://github.com/web-platform-tests/wpt/pull/20659.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/806

-- Commit Summary --

  * Insertion of empty DocumentFragment is a no-op

-- File Changes --

    M dom.bs (36)

-- Patch Links --

https://github.com/whatwg/dom/pull/806.patch
https://github.com/whatwg/dom/pull/806.diff

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