[w3c/ServiceWorker] Fix the perform the fetch steps in Update algorithm (#1175)

This fixes the peform the fetch steps so as for it not to synchronously
return true on success but to asynchronously coplete with response. This
factors the promise rejection of the fail cases out of the perform the
fetch steps so the fetch a * worker script algorithm's remaining step
will invoke the Reject Job Promise with provided error data.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1175

-- Commit Summary --

  * Fix the perform the fetch steps in Update algorithm

-- File Changes --

    M docs/index.bs (24)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1175.patch
https://github.com/w3c/ServiceWorker/pull/1175.diff

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https://github.com/w3c/ServiceWorker/pull/1175