[whatwg/dom] Use a single exception for name validation (follow up) (#675)

This addresses two cases overlooked by 61f40b0763e1:

* The QName production is a strict subset of the Name production.  To avoid confusion, drop "or Name" from the definition of "validate a qualifiedName".
* The non-normative "for web developers" text for `createElementNS` was not updated by the original commit.

Fixes: #671
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/675

-- Commit Summary --

  * Use a single exception for name validation (follow up)

-- File Changes --

    M dom.bs (6)

-- Patch Links --

https://github.com/whatwg/dom/pull/675.patch
https://github.com/whatwg/dom/pull/675.diff

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