Adjust /etc/docker/daemon.json cleanup comment with link to ansible-role-docker PR

roles/custom/matrix_playbook_migration/tasks/docker_daemon_options_file_cleanup.yml

@@ -16,6 +16,7 @@
 #
 # Here, we make the file go away of no options are set.
 # Idealy, this task would be part of the `ansible-role-docker` role, but it's not (yet).
+# See: https://github.com/geerlingguy/ansible-role-docker/pull/498
 - name: Ensure the Docker daemon options file is deleted when no longer needed
   when: matrix_playbook_docker_installation_daemon_options.keys() | length == 0
   ansible.builtin.file: