[fetch] Fixed typos. (#163)

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

  https://github.com/whatwg/fetch/pull/163

-- Commit Summary --

  * Fixed typos.

-- File Changes --

    M Overview.src.html (4)

-- Patch Links --

https://github.com/whatwg/fetch/pull/163.patch
https://github.com/whatwg/fetch/pull/163.diff

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https://github.com/whatwg/fetch/pull/163