[whatwg/fetch] Clarify the ABNF flavor in use (#490)

Fixes #489.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/490

-- Commit Summary --

  * Clarify the ABNF flavor in use

-- File Changes --

    M fetch.bs (34)

-- Patch Links --

https://github.com/whatwg/fetch/pull/490.patch
https://github.com/whatwg/fetch/pull/490.diff

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