[w3c/ServiceWorker] Editorial: correct method control flow (#1152)

The previous control flow for the `ServiceWorkerRegistration#update`
algorithm did not return a value under certain error conditions. Update
the algorithm steps to consistently return the Promise defined to track
the status of the operation.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1152

-- Commit Summary --

  * Editorial: correct method control flow

-- File Changes --

    M docs/index.bs (10)
    M docs/index.html (12)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1152.patch
https://github.com/w3c/ServiceWorker/pull/1152.diff

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