[whatwg/fetch] Document how new protocols relate to port blocking (#1106)

Closes #956.

cc @martinthomson 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1106

-- Commit Summary --

  * Document how new protocols relate to port blocking

-- File Changes --

    M fetch.bs (3)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1106.patch
https://github.com/whatwg/fetch/pull/1106.diff

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