[whatwg/fetch] Add reference to MIX in main fetch (PR #1578)

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- [x] At least two implementers are interested (and none opposed):
   * This was proposed originally as part of changes to MIX, which have since been implemented by Chrome and are in the process of being implemented by Firefox. Additionally Safari supported the MIX changes.
- [X] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * Tests exist under https://github.com/web-platform-tests/wpt/tree/master/mixed-content/tentative/autoupgrades.
- [X] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: This behavior is already launched in Chrome
   * Gecko: Unclear if bug exists yet, but it's planned for launching in Nightly soon (see discussion in web-platform-tests/wpt#37080)
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: Unclear if this necessary for this change since it doesn't add any new features.

(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/1578

-- Commit Summary --

  * Add reference to MIX in main fetch

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1578.patch
https://github.com/whatwg/fetch/pull/1578.diff

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