[w3c/selection-api] Throw InvalidNodeTypeError for doctype more eagerly (PR #342)

This matches how major engines behave and is covered by multiple tests in WPT already.

Closes #118.

Supersedes #86.

Note: I didn't touch `setBaseAndExtent` here, since Gecko throws on doctype but WebKit and Blink don't.


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  https://github.com/w3c/selection-api/pull/342

-- Commit Summary --

  * Throw InvalidNodeTypeError for doctype more eagerly

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/selection-api/pull/342.patch
https://github.com/w3c/selection-api/pull/342.diff

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