[w3c/ServiceWorker] Enabling client message queue on DOMContentLoaded is not mentioned in the spec (#1349)

In issue #728 changes were made both to this and the HTML spec, adding the `ServiceWorkerContainer.startMessages()` method and revising the way messages sent via `Client.postMessage()` are dispatched. Unfortunately, it's not clear from this spec alone that the client message queue is enabled when the `DOMContentLoaded` event is fired, as this detail is part of the HTML spec. I think an informative note would be very helpful here.

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https://github.com/w3c/ServiceWorker/issues/1349