Re: [whatwg/dom] Disconnect single target instead of all (#126)

To add a different use case, for which I don't think suppress would work, in the Custom Elements v1 polyfill, I want to be able to observe the main document and the roots of several disconnected DOM trees. If any of the observed roots are added to another, then I want to unobserve the root of the child subtree because the subtree is now being observed by the parent subtree's observer.

I would propose adding an `unobserve()` method to parallel `observe()`, rather than change `disconnect()`.

As for the record queue, I'd still need records from the unobserved subtree, so would prefer they remain, but could do a takeRecords() if necessary.

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