[whatwg/fetch] Explain CORS protocol and credentials interaction (#293)

WIP for #264.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/293

-- Commit Summary --

  * Explain CORS protocol and credentials interaction

-- File Changes --

    M Overview.html (87)
    M Overview.src.html (84)

-- Patch Links --

https://github.com/whatwg/fetch/pull/293.patch
https://github.com/whatwg/fetch/pull/293.diff

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