[w3c/ServiceWorker] Update environment settings object creation (#1527)

Part of https://github.com/whatwg/fetch/issues/1062. Also sets the new-ish fields on environments.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1527

-- Commit Summary --

  * Update environment settings object creation

-- File Changes --

    M docs/index.bs (14)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1527.patch
https://github.com/w3c/ServiceWorker/pull/1527.diff

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https://github.com/w3c/ServiceWorker/pull/1527