update playground doc (#15976)

quick-start-with-tidb.md

@@ -15,7 +15,7 @@ In addition, you can try out TiDB features on [TiDB Playground](https://play.tid
 
 > **Note:**
 >
-> The deployment method provided in this guide is **ONLY FOR** quick start, **NOT FOR** production.
+> The deployment method provided in this guide is **ONLY FOR** quick start, **NOT FOR** production or comprehensive functionality and stability testing.
 >
 > - To deploy a self-hosted production cluster, see the [production installation guide](/production-deployment-using-tiup.md).
 > - To deploy TiDB on Kubernetes, see [Get Started with TiDB on Kubernetes](https://docs.pingcap.com/tidb-in-kubernetes/stable/get-started).

tiup/tiup-faq.md

@@ -23,7 +23,7 @@ TiUP does not support third-party components for the time being, but the TiUP Te
 
 ## What is the difference between the TiUP playground and TiUP cluster components?
 
-The TiUP playground component is mainly used to build a stand-alone development environment on Linux or macOS operating systems. It helps you get started quickly and run a specified version of the TiUP cluster easily. The TiUP cluster component is mainly used to deploy and maintain a production environment cluster, which is usually a large-scale cluster.
+The TiUP playground component is mainly used to build a stand-alone development environment on Linux or macOS operating systems. It helps you get started quickly and run a specified version of the TiUP cluster easily. The TiUP cluster component is mainly used to deploy and maintain a production environment cluster, which is usually a large-scale cluster. TiDB clusters deployed by TiUP Playground might lack some features and operational capabilities, and it is not recommended for complete functional and stability testing.
 
 ## How do I write the topology file for the TiUP cluster component?