[whatwg/fetch] Headers API corrections (#833)

These commits address the shortcomings discussed in #748. I've yet to add tests (probably not today).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/833

-- Commit Summary --

  * Editorial: spell no-cors no-CORS as part of names
  * Close no-CORS Headers API holes

-- File Changes --

    M fetch.bs (66)

-- Patch Links --

https://github.com/whatwg/fetch/pull/833.patch
https://github.com/whatwg/fetch/pull/833.diff

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