[whatwg/fetch] Remove double-negative in CORS-preflight fetch credentials tags (#288)

Resolves #279 

First pull request - happy to change anything. Thanks for adding the `good first bug` label to issues!
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/288

-- Commit Summary --

  * Remove double-negative in CORS-preflight fetch credentials tags

-- File Changes --

    M Overview.src.html (12)

-- Patch Links --

https://github.com/whatwg/fetch/pull/288.patch
https://github.com/whatwg/fetch/pull/288.diff

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