fix(ec2): fix VPC endpoint name for SageMaker Notebooks (#2598)

The service name was incorrect as per
https://docs.aws.amazon.com/sagemaker/latest/dg/notebook-interface-endpoint.html

Author: chriswessells

packages/@aws-cdk/aws-ec2/lib/vpc-endpoint.ts

@@ -205,7 +205,7 @@ export interface IInterfaceVpcEndpointService {
  * An AWS service for an interface VPC endpoint.
  */
 export class InterfaceVpcEndpointAwsService implements IInterfaceVpcEndpointService {
-  public static readonly SageMakerNotebook = new InterfaceVpcEndpointAwsService('sagemaker', 'aws.sagemaker');
+  public static readonly SageMakerNotebook = new InterfaceVpcEndpointAwsService('notebook', 'aws.sagemaker');
   public static readonly CloudFormation = new InterfaceVpcEndpointAwsService('cloudformation');
   public static readonly CloudTrail = new InterfaceVpcEndpointAwsService('cloudtrail');
   public static readonly CodeBuild = new InterfaceVpcEndpointAwsService('codebuild');