Adjust validation message

roles/custom/matrix_playbook_migration/tasks/validate_config.yml

@@ -83,7 +83,7 @@
     - {'old': 'matrix_nginx_proxy_base_domain_create_directory', 'new': '<no longer necessary; see matrix_static_files_file_index_html_enabled>'}
     - {'old': 'matrix_nginx_proxy_proxy_riot_compat_redirect_enabled', 'new': '<redirecting the riot domain to an element domain is no longer supported - you can implement it yourself using matrix_client_element_container_labels_additional_labels>'}
     - {'old': 'matrix_nginx_proxy_proxy_riot_compat_redirect_hostname', 'new': '<redirecting the riot domain to an element domain is no longer supported - you can implement it yourself using matrix_client_element_container_labels_additional_labels>'}
-    - {'old': 'matrix_nginx_proxy_proxy_matrix_client_redirect_root_uri_to_domain', 'new': '<superseded by matrix_synapse_container_labels_client_root_redirection_url or matrix_synapse_reverse_proxy_companion_container_labels_client_root_redirection_url or another equivalent based on the homeserver implementation you use>'}
+    - {'old': 'matrix_nginx_proxy_proxy_matrix_client_redirect_root_uri_to_domain', 'new': '<superseded by matrix_synapse_container_labels_client_root_redirection_* or matrix_synapse_reverse_proxy_companion_container_labels_client_root_redirection_* or other equivalent variables based on the homeserver implementation you use>'}
 
 - name: (Deprecation) Catch and report matrix_postgres variables
   ansible.builtin.fail: