[w3c/DOM-Parsing] innerHTML should be defined on ShadowRoot interface in addition to Element interface (#21)

In the world where `ShadowRoot` interface is merged into DOM (as done in the [WHATWG version](https://dom.spec.whatwg.org/#interface-shadowroot)), it's more natural for the DOM parsing & serialization spec to define `innerHTML` IDL attribute on both `Element` and `ShadowRoot` interfaces.

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https://github.com/w3c/DOM-Parsing/issues/21