Re: [ServiceWorker] Document the headers being introduced (#717)

I think `Service-Worker-Allowed` should match `Location` in terms of URL parsing and both should allow basically any relative URL. And I think as far as the contents, the browser will allow "any" for either and not require a specific production.

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https://github.com/slightlyoff/ServiceWorker/issues/717#issuecomment-114661416