I've upgraded to Fedora 42 just now, following the instructions from the documentation:
https://docs.fedoraproject.org/en-US/quick-docs/upgrading-fedora-offline/

I'm now going through the post-upgrade tasks from that documentation.
In the section "Clean-up old packages":
https://docs.fedoraproject.org/en-US/quick-docs/upgrading-fedora-offline/#sect-clean-up-old-packages
it recommends running these two commands:

sudo dnf repoquery --duplicates
sudo dnf remove --duplicates

The latter command yields the following output:

Unknown argument "--duplicates" for command "remove". Add "--help" for more information about the arguments.
The argument is available for commands: check, repoquery. (It has to be placed after the command.)

I think the documentation needs to be updated to reflect that the recommended dnf command isn't available anymore, and an alternative should be added to the documentation.

Reproducible: Always