[w3c/ServiceWorker] Explain message and messageerror for ServiceWorkerContainer. (#1572)

Addresses #1549
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1572

-- Commit Summary --

  * Explain message and messageerror for ServiceWorkerContainer.

-- File Changes --

    M docs/index.bs (14)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1572.patch
https://github.com/w3c/ServiceWorker/pull/1572.diff

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https://github.com/w3c/ServiceWorker/pull/1572