Re: [webcomponents] Rename custom tag (#434)

I don't like these that much, but they are probably an improvement over the current... Here are my vague thoughts:

- custom named element: is this custom-named element, or custom named-element? If the latter, all elements are named, so just shorten to custom element. If the former, then it seems weird that what we're emphasizing about this element's custom-ness is its name.
- custom builtin element: Must be custom builtin-element. But that seems like an oxymoron. "builtin element customization" seems more accurate, I guess.

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https://github.com/w3c/webcomponents/issues/434#issuecomment-195583932