[whatwg/dom] "connected" should be defined for all kinds of nodes (Issue #1259)

### What is the issue with the DOM Standard?

> An [element](https://dom.spec.whatwg.org/#concept-element) is connected if its [shadow-including root](https://dom.spec.whatwg.org/#concept-shadow-including-root) is a [document](https://dom.spec.whatwg.org/#concept-document).

Since `isConnected` is an attribute of `Node`, the "connected" concept should be defined for all kinds of nodes, not just elements.

HTML also expects text nodes to have "connected" defined, as otherwise text outside an open modal dialog is not inert: https://html.spec.whatwg.org/multipage/interaction.html#modal-dialogs-and-inert-subtrees

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