docs: update v3 steps for NGINX One config proxy (#873)

* docs: update v3 steps for NGINX One config proxy

Author: JTorreG

content/nginx-one/connect-instances/set-up-nginx-proxy-for-nginx-one.md

@@ -69,18 +69,40 @@ To set up your other NGINX instances to use the proxy instance to connect to NGI
 2. Open the NGINX Agent configuration file (**/etc/nginx-agent/nginx-agent.conf**) with a text editor.
 3. Add the following configuration. Replace `YOUR_DATA_PLANE_KEY_HERE` with your actual data plane key and `YOUR_PROXY_IP_ADDRESS_HERE` with the IP address of the NGINX proxy instance.
 
-    ```yaml
-    command:
-      server:
-        # Replace YOUR_PROXY_IP_ADDRESS_HERE with the IP address of the NGINX proxy instance.
-        host: YOUR_PROXY_IP_ADDRESS_HERE
-        port: 443
-      auth:
-        # Replace YOUR_DATA_PLANE_KEY_HERE with your NGINX One Console data plane key.
-        token: "YOUR_DATA_PLANE_KEY_HERE"
-      tls:
-        skip_verify: False
-    ```
+   {{< tabs name="Configure NGINX Agent to use the proxy" >}}
+
+   {{%tab name="NGINX Agent 3.x"%}}
+
+   ```yaml
+   command:
+   server:
+      # Replace YOUR_PROXY_IP_ADDRESS_HERE with the IP address of the NGINX proxy instance.
+      host: YOUR_PROXY_IP_ADDRESS_HERE
+      port: 5000
+   auth:
+      # Replace YOUR_DATA_PLANE_KEY_HERE with your NGINX One Console data plane key.
+      token: "YOUR_DATA_PLANE_KEY_HERE"
+   tls:
+      skip_verify: False
+      server_name: "agent.connect.nginx.com"
+   ```
+
+   {{%/tab%}}
+   {{%tab name="NGINX Agent 2.x"%}}
+   ```yaml
+   command:
+   server:
+      # Replace YOUR_PROXY_IP_ADDRESS_HERE with the IP address of the NGINX proxy instance.
+      host: YOUR_PROXY_IP_ADDRESS_HERE
+      port: 443
+   auth:
+      # Replace YOUR_DATA_PLANE_KEY_HERE with your NGINX One Console data plane key.
+      token: "YOUR_DATA_PLANE_KEY_HERE"
+   tls:
+      skip_verify: False
+   ```
+   {{%/tab%}}
+   {{%/tabs%}}
 
 4. Restart NGINX Agent: