Re: [webcomponents] Custom elements disconnected from a document should not be upgraded (#419)

Since nobody besides me seems enthusiastic about `customElements.upgrade()`, we can leave it as a v2 feature. I'll close this now. I've added an example illustrating the edge-cases around upgrades and in-document-ness to https://w3c.github.io/webcomponents/spec/custom/#custom-elements-upgrades-examples.

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