[whatwg/fetch] Add CORS protocol examples (#297)

Fixes #296.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/297

-- Commit Summary --

  * Add CORS protocol examples

-- File Changes --

    M Overview.html (80)
    M Overview.src.html (77)

-- Patch Links --

https://github.com/whatwg/fetch/pull/297.patch
https://github.com/whatwg/fetch/pull/297.diff

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