[whatwg/fetch] Editorial: Reword how-to section to explain how to use callbacks & controller (PR #1614)

Instead of describing the callbacks one by one, putting emphasis on how/when the caller expects responses (upon completion, chunk-by-chunk, fire-and-forget).

This (hopefully) gives other specs who need to call into Fetch a quick reference between what they're trying to do and the API.

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1614


-- Commit Summary --

  * Reword how-to section to explain how to use callbacks & controller

-- File Changes --

    M fetch.bs (181)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1614.patch

https://github.com/whatwg/fetch/pull/1614.diff


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