[whatwg/fetch] Reference RFC 7578 instead of RFC 2388 (#404)

RFC 2388 has been obsoleted by RFC 7578. This change reflects a similar
change applied to the HTML spec.

See https://github.com/whatwg/html/issues/398 for discussion.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/404

-- Commit Summary --

  * Reference RFC 7578 instead of RFC 2388

-- File Changes --

    M fetch.bs (3)

-- Patch Links --

https://github.com/whatwg/fetch/pull/404.patch
https://github.com/whatwg/fetch/pull/404.diff

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