[w3c/ServiceWorker] Clarify "uncaught runtime script error". (#1346)

The HTML standard returns Completion Records to convey the result
of running a script. Use that.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1346

-- Commit Summary --

  * Clarify "uncaught runtime script error".

-- File Changes --

    M docs/index.bs (105)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1346.patch
https://github.com/w3c/ServiceWorker/pull/1346.diff

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