[slightlyoff/ServiceWorker] Typo fixes (#944)

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

  https://github.com/slightlyoff/ServiceWorker/pull/944

-- Commit Summary --

  * Typo fixes

-- File Changes --

    M explainer.md (7)

-- Patch Links --

https://github.com/slightlyoff/ServiceWorker/pull/944.patch
https://github.com/slightlyoff/ServiceWorker/pull/944.diff

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