[whatwg/fetch] Add examples for collect an HTTP quoted string (#1069)

And remove a confusing note.

Closes #1068.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1069

-- Commit Summary --

  * Add examples for collect an HTTP quoted string

-- File Changes --

    M fetch.bs (28)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1069.patch
https://github.com/whatwg/fetch/pull/1069.diff

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