[whatwg/dom] adoptNode() should always return a node (#1006)

In the [adoptNode()](https://dom.spec.whatwg.org/#dom-document-adoptnode) steps, step 3 says "If node is a DocumentFragment node whose host is non-null, then return.", but the [interface](https://dom.spec.whatwg.org/#ref-for-dom-document-adoptnode) defines `adoptNode()` as always returning a node. Shouldn't step 3 either return node or throw, or am I missing something from IDL that would allow returning nothing?

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