[whatwg/fetch] fix a typo (#1089)

removing what looks like a repetition typo.

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

  https://github.com/whatwg/fetch/pull/1089


-- Commit Summary --

  * fix a typo

-- File Changes --

    M fetch.bs (5)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1089.patch

https://github.com/whatwg/fetch/pull/1089.diff


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