update README.md

Author: Victor Tsang

javascript/cluster_management/README.md

@@ -2,29 +2,38 @@
 
 ## Overview
 
-The code examples in this topic show you how to use the JavaScript work with Aurora DSQL. 
+The code examples in this topic show you how to use the AWS JavaScript SDK v3 with DSQL
+to create, update, get, and delete single- and multi-Region clusters.
+
+Each file in the [/src](src) directory demonstrates a minimal
+working example for each operation.
 
 ## Run the examples
 
+### ⚠️ Important
+
+- Running this code might result in charges to your AWS account.
+- We recommend that you grant your code least privilege. At most, grant only the
+  minimum permissions required to perform the task. For more information, see
+  [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege).
+- This code is not tested in every AWS Region. For more information, see
+  [AWS Regional Services](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services).
+
 ### Prerequisites
 
-* Node version >= 18.0.0 is needed
+- [Node 18.0.0](https://nodejs.org) or later.
+- Valid AWS credentials can be discovered by the [default provider chain](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials-chain.html).
 
-### Install the required dependencies
+### Execute tests to create and delete clusters
 
-```sh
-npm install
 ```
+npm install
 
-### Run the example tests
-
-```sh
-# Use the account credentials dedicated for JS
-npm run test
+npm test
 ```
 
 ---
 
-Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. 
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 
-SPDX-License-Identifier: MIT-0
+SPDX-License-Identifier: MIT-0