Add comment of which runtime is expected

[Max-Derner]

During Lab "Creating a Lambda Function Using the AWS Console", it is expected to create a Lambda function using the code creating-a-lambda-function-using-the-aws-console/index.js.

Currently Lambda defaults to Node.js 20.x, however the code supplied is for Node.js 16.x. I propose that a one line comment is added to the top of the code to state that it requires the Node 16.x runtime.