[whatwg/fetch] Editorial: correct typo (#533)

Insert omitted word.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/533

-- Commit Summary --

  * Editorial: correct typo

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/533.patch
https://github.com/whatwg/fetch/pull/533.diff

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