[slightlyoff/ServiceWorker] Fix Typo: "necessary" (#895)

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

  https://github.com/slightlyoff/ServiceWorker/pull/895

-- Commit Summary --

  * Fix Typo: "necessary"

-- File Changes --

    M foreign_fetch_explainer.md (2)

-- Patch Links --

https://github.com/slightlyoff/ServiceWorker/pull/895.patch
https://github.com/slightlyoff/ServiceWorker/pull/895.diff

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