[whatwg/fetch] Clarify why request's url field exists (#292)

Fixes #275.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/292

-- Commit Summary --

  * Clarify why request's url field exists

-- File Changes --

    M Overview.html (5)
    M Overview.src.html (5)

-- Patch Links --

https://github.com/whatwg/fetch/pull/292.patch
https://github.com/whatwg/fetch/pull/292.diff

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