fix readme

Author: msambol

packages/aws-cdk-lib/aws-ecr/README.md

@@ -217,7 +217,7 @@ You can publish repository events to a CloudWatch event rule with `onEvent`:
 import * as lambda from 'aws-cdk-lib/aws-lambda';
 
 const repo = new ecr.Repository(this, 'Repo');
-const lambdaFunction = new lambda.Function(stack, 'LambdaFunction', {
+const lambdaFunction = new lambda.Function(this, 'LambdaFunction', {
   runtime: lambda.Runtime.PYTHON_3_12,
   code: lambda.Code.fromInline('# dummy func'),
   handler: 'index.handler',