[whatwg/dom] Avoid enqueuing tree mutation record when there is no mutation (#822)

Fixes #796.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/822

-- Commit Summary --

  * Capitalize "queue a tree mutation record" in "insert"
  * Avoid enqueuing tree mutation record when there is no mutation

-- File Changes --

    M dom.bs (8)

-- Patch Links --

https://github.com/whatwg/dom/pull/822.patch
https://github.com/whatwg/dom/pull/822.diff

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