[whatwg/fetch] Reference correct WebSocket protocol RFC (#614)

Fixes #613.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/614

-- Commit Summary --

  * Reference correct WebSocket protocol RFC

-- File Changes --

    M fetch.bs (6)

-- Patch Links --

https://github.com/whatwg/fetch/pull/614.patch
https://github.com/whatwg/fetch/pull/614.diff

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