[w3c/ServiceWorker] Fix: Ensure timingInfo is returned on network fallback if SW static routing API is used (PR #1774)

According to the [explainer](https://github.com/WICG/service-worker-static-routing-api/blob/main/resource-timing-api.md#correspondence-of-the-matched-source-type-and-the-actual-source-type), the `worker final router source` should be `'network'` for a network fallback.  The |timingInfo| is returned to make that happen.


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

  https://github.com/w3c/ServiceWorker/pull/1774

-- Commit Summary --

  * Return timingInfo on fetch handler failure if static routing
  * May be simplify the procedure

-- File Changes --

    M docs/index.bs (8)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1774.patch
https://github.com/w3c/ServiceWorker/pull/1774.diff

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