[w3c/ServiceWorker] Correct ServiceWorkerRegistration Web IDL (PR #1767)

As mentioned in https://github.com/w3c/ServiceWorker/issues/1472, https://w3c.github.io/ServiceWorker/#resolve-job-promise-algorithm is written to return Promise<ServiceWorkerRegistration>. Also, according to https://wpt.fyi/results/service-workers/service-worker/update-result.https.html?label=experimental&label=master&aligned, all implementations are actually returning a `Promise<ServiceWorkerRegistration>`.


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

  https://github.com/w3c/ServiceWorker/pull/1767

-- Commit Summary --

  * Correct ServiceWorkerRegistration Web IDL

-- File Changes --

    M docs/index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1767.patch
https://github.com/w3c/ServiceWorker/pull/1767.diff

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