fix: adding instructions for the sake of security

functions/kubernetes/kubernetes.md

@@ -8,11 +8,13 @@
 
   ```
   chmod +x generate_certs.sh
-  ./generate_certs.sh
+  ./setup_registry.sh
   ```
 
   > This will give you a NODE_IP which is you're local IP if you're not sure about what to use.
   
+  > **Make sure that port 5000 is not exposed to the internet!**
+
 - 8 GB RAM and 4 CPUs are recommended as **minimum configs** for running Shuffle on Kubernetes. K8s is a resource-intensive application, and you may experience performance issues if you run it on a machine with fewer resources.
 
 - If you've used the above commands to set up a registry, you'll need to skip an SSL verification for your registry. If you're using Containerd as a runtime