[whatwg/fetch] Give all bodies a stream (#1177)

This simplifies some wording introduced in #425 and aligns it with the recently introduced cloning for service workers.

Fixes #1176.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1177

-- Commit Summary --

  * Give all bodies a stream

-- File Changes --

    M fetch.bs (26)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1177.patch
https://github.com/whatwg/fetch/pull/1177.diff

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