[whatwg/fetch] Clarify requirements on a CORS server (#511)

Fixes #172.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/511

-- Commit Summary --

  * Clarify requirements on a CORS server

-- File Changes --

    M fetch.bs (7)

-- Patch Links --

https://github.com/whatwg/fetch/pull/511.patch
https://github.com/whatwg/fetch/pull/511.diff

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