[whatwg/fetch] Address Domenic's Request domintro nits (#619)

@domenic Addressing your Request domintro nits here, and will add the other `init` member info to the constructor entry in the domintro box in another PR soon. That should finish the Request stuff.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/619

-- Commit Summary --

  * Address Domenic's Request domintro nits

-- File Changes --

    M fetch.bs (31)

-- Patch Links --

https://github.com/whatwg/fetch/pull/619.patch
https://github.com/whatwg/fetch/pull/619.diff

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