Adjust message when webhook bridge is activated but nginx-proxy is not

roles/matrix-bridge-appservice-webhooks/tasks/init.yml

@@ -72,7 +72,7 @@
     msg: >-
       NOTE: You've enabled the Matrix webhooks bridge but are not using the matrix-nginx-proxy
       reverse proxy.
-      Please make sure that you're proxying the `{{ something }}`
+      Please make sure that you're proxying the `{{ matrix_appservice_webhooks_public_endpoint }}`
       URL endpoint to the matrix-appservice-webhooks container.
       You can expose the container's port using the `matrix_appservice_webhooks_container_http_host_bind_port` variable.
   when: "matrix_appservice_webhooks_enabled|bool and matrix_nginx_proxy_enabled is not defined"