Update virtual-node.ts method doc

The issue at aws/aws-app-mesh-roadmap#120 is now completed, so I imagine multiple virtual node listeners is now possible.

packages/aws-cdk-lib/aws-appmesh/lib/virtual-node.ts

@@ -223,13 +223,6 @@ export class VirtualNode extends VirtualNodeBase {
 
   /**
    * Utility method to add an inbound listener for this VirtualNode
-   *
-   * Note: At this time, Virtual Nodes support at most one listener. Adding
-   * more than one will result in a failure to deploy the CloudFormation stack.
-   * However, the App Mesh team has plans to add support for multiple listeners
-   * on Virtual Nodes and Virtual Routers.
-   *
-   * @see https://github.com/aws/aws-app-mesh-roadmap/issues/120
    */
   public addListener(listener: VirtualNodeListener) {
     if (!this.serviceDiscoveryConfig) {