[docs] Add warning message in "Deploying Local Cluster" page (#2156)

Co-authored-by: jackeyzhe <[email protected]>

Author: Jackeyzhe

website/docs/install-deploy/deploying-local-cluster.md

@@ -4,6 +4,11 @@ sidebar_position: 2
 ---
 
 # Deploying Local Cluster
+:::warning
+**This setup deploys Fluss to a single machine only.** The Fluss endpoint will **only be accessible locally** (e.g. via `localhost`).
+If you need access your Fluss cluster from a different machine or deploy across multiple servers, please refer to the [Deploying Distributed Cluster](install-deploy/deploying-distributed-cluster.md).
+That guide explains how to use `coordinator-server.sh` and `tablet-server.sh` with an externally accessible homename and port.
+:::
 
 This page provides instructions on how to deploy a *local cluster* (on one machine, but in separate processes) for Fluss.