[w3c/ServiceWorker] Fix typos (#1128)

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

  https://github.com/w3c/ServiceWorker/pull/1128

-- Commit Summary --

  * Fix typos

-- File Changes --

    M foreign_fetch_explainer.md (8)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1128.patch
https://github.com/w3c/ServiceWorker/pull/1128.diff

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