[whatwg/fetch] Clarify how Headers does not support Set-Cookie (#714)

Fixes #345.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/714

-- Commit Summary --

  * Clarify how Headers does not support Set-Cookie

-- File Changes --

    M fetch.bs (11)

-- Patch Links --

https://github.com/whatwg/fetch/pull/714.patch
https://github.com/whatwg/fetch/pull/714.diff

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