[whatwg/fetch] Return network error for scheme-fetch for ftp/file (#699)

Currently, it's defined as "exercise for the reader".
I suggest changing the wording to default to network error.

Is this acceptable?
If yes, is this patch OK or do we want to add a note?

CCing @evilpie 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/699

-- Commit Summary --

  * Return network error for scheme-fetch for ftp/file

-- File Changes --

    M fetch.bs (6)

-- Patch Links --

https://github.com/whatwg/fetch/pull/699.patch
https://github.com/whatwg/fetch/pull/699.diff

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