[whatwg/fetch] Editorial: Add prose about CORS, cross-origin isolation and TAO (PR #1806)

Add a section to "using fetch elsewhere" that describes in a nutshell what new standards that invoke fetch should take
into the consideration when integrating with the same-origin policy protections enforced in the Fetch standard.

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- [ ] At least two implementers are interested (and none opposed):
   * Prose only, but would be good to have some cross-implementor eyes on it.
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * N/A: prose only
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * N/A: prose only
- [x] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
   * N/A: prose only
- [x] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->

(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/1806

-- Commit Summary --

  * Add prose about CORS, cross-origin isolation and TAO

-- File Changes --

    M fetch.bs (100)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1806.patch
https://github.com/whatwg/fetch/pull/1806.diff

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