Clarify VPC router source NAT description

Author: andrijapanicsb

api/src/main/java/org/apache/cloudstack/api/command/user/vpc/CreateVPCCmd.java

@@ -117,7 +117,7 @@ public class CreateVPCCmd extends BaseAsyncCreateCmd implements UserCmd {
     @Parameter(name = ApiConstants.IP6_DNS2, type = CommandType.STRING, description = "The second IPv6 DNS for the VPC", since = "4.18.0")
     private String ip6Dns2;
 
-    @Parameter(name = ApiConstants.SOURCE_NAT_IP, type = CommandType.STRING, description = "Optional IPv4 address to assign to the public interface of the Network router. " +
+    @Parameter(name = ApiConstants.SOURCE_NAT_IP, type = CommandType.STRING, description = "Optional IPv4 address to assign to the public interface of the VPC router. " +
             "This address will be used as the Source NAT address for the Networks in this VPC. " +
             "\nIf an address is given and it cannot be acquired, an error will be returned and the Network will not be implemented.",
             since = "4.19")