[w3c/ServiceWorker] Fix a typo (#1459)

Removing a redundant period.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1459

-- Commit Summary --

  * Fix a typo

-- File Changes --

    M docs/index.bs (2)
    M docs/v1/index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1459.patch
https://github.com/w3c/ServiceWorker/pull/1459.diff

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