[whatwg/fetch] Editorial: Add prose about constructing a request (PR #1585)

This intends to be a summary of informative notes in the #Requests section, into a concise "starter" guide to populating a request, which is usually the tricky bit of using Fetch.

Requested by authors of other specs, see for example: https://github.com/w3ctag/design-principles/issues/238 https://github.com/fedidcg/FedCM/issues/320


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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/1585


-- Commit Summary --

  * Editorial: Add prose about constructing a request

-- File Changes --

    M fetch.bs (50)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1585.patch

https://github.com/whatwg/fetch/pull/1585.diff


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