[whatwg/fetch] Block AFP ports (427, 548) (#738)

Also remove some obsolete comments.

Fixes #694.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/738

-- Commit Summary --

  * Block AFP ports (427, 548)

-- File Changes --

    M fetch.bs (21)

-- Patch Links --

https://github.com/whatwg/fetch/pull/738.patch
https://github.com/whatwg/fetch/pull/738.diff

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