message: doc, guix: Include arm64-apple-darwin into codesigned archs
  Github-Pull:
  Rebased-From:
diff: @@ -75,7 +75,7 @@ crucial differences:
  1. Since only Windows and macOS build outputs require codesigning, the `HOSTS`
  environment variable will have a sane default value of `x86_64-w64-mingw32
  - x86_64-apple-darwin` instead of all the platforms.
  + x86_64-apple-darwin arm64-apple-darwin` instead of all the platforms.
  2. The `guix-codesign` command ***requires*** a `DETACHED_SIGS_REPO` flag.
  * _**DETACHED_SIGS_REPO**_
  