[whatwg/fetch] Fix typos (#1065)

This PR fixes a couple of typos I noticed:
* resources -> resource
* chose -> choose
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1065

-- Commit Summary --

  * Fix typos

-- File Changes --

    M fetch.bs (5)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1065.patch
https://github.com/whatwg/fetch/pull/1065.diff

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https://github.com/whatwg/fetch/pull/1065