[whatwg/dom] Fix TreeWalker's nextNode() (#612)

The prose supposed to be equivalent to iterating over following siblings and siblings of ancestors did not skip over descendants.

See https://github.com/whatwg/dom/issues/87#issuecomment-374385254.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/612

-- Commit Summary --

  * Fix TreeWalker's nextNode()

-- File Changes --

    M dom.bs (5)

-- Patch Links --

https://github.com/whatwg/dom/pull/612.patch
https://github.com/whatwg/dom/pull/612.diff

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https://github.com/whatwg/dom/pull/612