Re: [whatwg/dom] Fix and clarify more around CDATASection (#301)

One relevant difference between CDATASection and ShadowRoot is that CDATASection has its own nodeType. So switching on nodeType actually works for ShadowRoot, but not for CDATASection. Since we'll presumably never add a new nodeType, actually spelling out whether CDATASection is included anywhere that Text is mentioned would remove the risk of confusion.

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