Re: [fetch] Add an example using Response body (#138)

> Can you also update the initial paragraph of https://fetch.spec.whatwg.org/#fetch-api to say "lacking when it comes to request progression (not response progression)"?

Done.

Regarding the example, code, I agree that the previous one is more elegant and it's unfortunate that existing implementations cannot execute it efficiently. That said, we received a report related with this problem once, so encouraging the pattern is dangerous at least for now, I think.

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