[whatwg/dom] Clarify create an element assertion (Issue #1338)

@domenic in create an element we have:

> Assert: result’s [custom element state](https://dom.spec.whatwg.org/#concept-element-custom-element-state) and [custom element definition](https://dom.spec.whatwg.org/#concept-element-custom-element-definition) are initialized.

Can we improve this by saying custom element definition is non-null? And custom element state is "custom"? I think that should hold after a successful constructor call.

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