[w3c/DOM-Parsing] Restore serialization of CDATASection nodes (#38)

CDATASection nodes returned to the DOM specification in https://github.com/whatwg/dom/pull/295, and browsers still allow them to be serialized. The serialization steps (which are still present [in a comment](https://github.com/w3c/DOM-Parsing/blob/gh-pages/index.html#L1511) within this specification) should be restored here as well.

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