[dom] Incorrect link in createEvent definition (#73)

https://dom.spec.whatwg.org/#dom-document-createevent has the text:

    Let event be the result of invoking the initial value of constructor with the empty string as argument. 

where "invoking" is a link to https://dom.spec.whatwg.org/#concept-event-listener-invoke

But that's not the invoking happening here.

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https://github.com/whatwg/dom/issues/73