update to reflect added crypt and deleted dkim volume

docs/debug-rm_volumes.md

@@ -7,7 +7,7 @@ docker volume rm mailcowdockerized_${VOLUME_NAME}
 - Remove volume `mysql-vol-1` to remove all MySQL data.
 - Remove volume `redis-vol-1` to remove all Redis data.
 - Remove volume `vmail-vol-1` to remove all contents of `/var/vmail` mounted to `dovecot-mailcow`.
-- Remove volume `dkim-vol-1` to remove all DKIM keys.
 - Remove volume `rspamd-vol-1` to remove all Rspamd data.
+- Remove volume `crypt-vol-1` to remove all crypto data. This will render **all mails** unreadable.
 
 Running `docker-compose down -v` will **destroy all mailcow: dockerized volumes** and delete any related containers and networks.