fix readme

Author: seshubaws

apigw-rest-api-lambda-java/README.md

@@ -2,7 +2,7 @@
 
 This project contains source code and supporting files for a serverless application that you can deploy with the AWS SAM CLI. It includes the following files and folders.
 
-- hello_world - Code for the application's Lambda function.
+- HelloWorldFunction/src - Code for the application's Lambda function.
 - events - Invocation events that you can use to invoke the function.
 - template.yaml - A template that defines the application's AWS resources.