[whatwg/dom] Wrong return type of Node::getRootNode() (#739)

The WhatWG page on [Node::getRootNode](https://dom.spec.whatwg.org/#interface-node) states that this function returns an object of type `Node`. Yet, shouldn't it state, instead, that this function returns an object of type `ShadowRoot`?

/see also: /mdn/sprints/issues/1204

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