[whatwg/fetch] Change 3.2.6 Examples to reflect current state of implementations (#858)

This changes the examples for CORS protocol and credentials to reflect
the current state of the implementations as discussed on issue #855.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/858

-- Commit Summary --

  * Change 3.2.6 Examples to reflect current state of implementations

-- File Changes --

    M fetch.bs (6)

-- Patch Links --

https://github.com/whatwg/fetch/pull/858.patch
https://github.com/whatwg/fetch/pull/858.diff

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