Update connect-to-premium-via-public-connection.md (#21983)

Author: qiancai

tidb-cloud/premium/connect-to-premium-via-public-connection.md

@@ -36,9 +36,9 @@ To connect to a {{{ .premium }}} instance via public connection, take the follow
 
     If you have not configured the IP access list, click **Configure IP Access List** or follow the steps in [Configure an IP Access List](/tidb-cloud/premium/configure-ip-access-list-premium.md) to configure it before your first connection.
 
-4. Click **CA cert** to download CA cert for TLS connection to TiDB instances. The CA cert supports TLS 1.2 version by default.
+    <!-- 4. Click **CA cert** to download CA cert for TLS connection to TiDB instances. The CA cert supports TLS 1.2 version by default. -->
 
-5. Choose your preferred connection method, and then refer to the connection string and sample code on the tab to connect to your instance.
+4. Choose your preferred connection method, and then refer to the connection string and sample code on the tab to connect to your instance.
 
 ## What's next