docs(appmesh): clarifying the difference between constructor and method to create a resource

packages/@aws-cdk/aws-appmesh/README.md

@@ -73,7 +73,11 @@ const router = mesh.addVirtualRouter('router', {
 ```
 
 The router can also be created using the constructor and passing in the mesh instead of calling the `addVirtualRouter()` method for the mesh.
-The same pattern applies to all constructs within the appmesh library, for any mesh.addXZY method, a new constuctor can also be used.
+Note that creating the router using the `addVirtualRouter()` method places it in the same Stack that the mesh belongs to
+(which might be different from the current Stack).
+The same pattern applies to all constructs within the appmesh library, for any mesh.addXZY method, a new constructor can also be used.
+(For example, see [Adding a VirtualNode](https://docs.aws.amazon.com/cdk/api/latest/docs/aws-appmesh-readme.html#adding-a-virtualnode)
+ and [Adding a Virtual Gateway](https://docs.aws.amazon.com/cdk/api/latest/docs/aws-appmesh-readme.html#adding-a-virtual-gateway) sections)
 This is particularly useful for cross stack resources are required.
 Where creating the `mesh` as part of an infrastructure stack and creating the `resources` such as `nodes` is more useful to keep in the application stack.
 

packages/@aws-cdk/aws-appmesh/lib/mesh.ts

@@ -23,7 +23,7 @@ export enum MeshFilterType {
 }
 
 /**
- * Interface wich all Mesh based classes MUST implement
+ * Interface which all Mesh based classes MUST implement
  */
 export interface IMesh extends cdk.IResource {
  /**
@@ -41,17 +41,23 @@ export interface IMesh extends cdk.IResource {
  readonly meshArn: string;
 
  /**
- * Adds a VirtualRouter to the Mesh with the given id and props
+ * Creates a new VirtualRouter in this Mesh.
+ * Note that the Router is created in the same Stack that this Mesh belongs to,
+ * which might be different than current stack.
  */
  addVirtualRouter(id: string, props?: VirtualRouterBaseProps): VirtualRouter;
 
  /**
- * Adds a VirtualNode to the Mesh
+ * Creates a new VirtualNode in this Mesh.
+ * Note that the Node is created in the same Stack that this Mesh belongs to,
+ * which might be different than current stack.
  */
  addVirtualNode(id: string, props?: VirtualNodeBaseProps): VirtualNode;
 
  /**
- * Adds a VirtualGateway to the Mesh
+ * Creates a new VirtualGateway in this Mesh.
+ * Note that the Gateway is created in the same Stack that this Mesh belongs to,
+ * which might be different than current stack.
  */
  addVirtualGateway(id: string, props?: VirtualGatewayBaseProps): VirtualGateway;
 }
@@ -108,7 +114,7 @@ export interface MeshProps {
  /**
  * The name of the Mesh being defined
  *
- * @default - A name is autmoatically generated
+ * @default - A name is automatically generated
  */
  readonly meshName?: string;