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

 * Make appendChild(cdata) and similar not throw.
 * Let nodeName be #cdata-section.
 * Include CDATASection as a node in an exhaustive enumeration.
 * Collapse cases of Text+PI+Comment to CharacterData where possible
   so that it's more clear that subtypes are included.
 * Say "depending on" instead of "switched" on.

Part of #300.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/301

-- Commit Summary --

  * Fix and clarify more around CDATASection

-- File Changes --

    M dom.bs (67)

-- Patch Links --

https://github.com/whatwg/dom/pull/301.patch
https://github.com/whatwg/dom/pull/301.diff

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