Update networking.md

Author: craigshoemaker

articles/container-apps/networking.md

@@ -270,7 +270,7 @@ You can use NAT Gateway to simplify outbound connectivity for your outbound inte
 
 When you configure a NAT Gateway on your subnet, the NAT Gateway provides a static public IP address for your environment. All outbound traffic from your container app is routed through the NAT Gateway's static public IP address.
 
-### <a name="public-network-access"></a>Public network access
+### <a name="public-network-access"></a>Public network access (preview)
 
 The public network access setting determines whether your container apps environment is accessible from the public Internet. Whether you can change this setting after creating your environment depends on the environment's virtual IP configuration. The following table shows valid values for public network access, depending on your environment's virtual IP configuration.