[w3c/ServiceWorker] Fixing ready promise definition (#1487)

I think this matches what browsers actually do.

Fixes #1477.

Tests incoming…

cc @youennf @asutherland @cdumez @Yannic
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1487


-- Commit Summary --

  * Fixing ready promise definition

-- File Changes --

    M docs/index.bs (4)
    M docs/v1/index.bs (4)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1487.patch

https://github.com/w3c/ServiceWorker/pull/1487.diff


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