Update intro.md

Correct the definition of KCL.

1. It is not true that it means "Kubernetes Configuration Language", and that gives the misleading impression it is just for Kubernetes
2. Instead, some mention should be given to the true origin of the name, a reference to Kusion.
3. But it is important to clarify that it is now independent of Kusion.

Author: benissimo

docs/user_docs/getting-started/intro.md

@@ -6,7 +6,7 @@ sidebar_position: 1
 
 ## What is KCL?
 
-[KCL](https://github.com/kcl-lang/kcl) is an open-source configuration and policy language hosted by the Cloud Native Computing Foundation (CNCF) as a Sandbox Project. Built on a foundation of constraints and functional programming principles, KCL enhances the process of writing complex configurations, particularly in cloud-native environments. By leveraging advanced programming language techniques, KCL promotes improved modularity, scalability, and stability in configuration management. It simplifies logic writing, offers easy-to-use automation APIs, and seamlessly integrates with existing systems. KCL is short for Kubernetes Configuration Language.
+[KCL](https://github.com/kcl-lang/kcl) is an open-source configuration and policy language hosted by the Cloud Native Computing Foundation (CNCF) as a Sandbox Project. Built on a foundation of constraints and functional programming principles, KCL enhances the process of writing complex configurations, particularly in cloud-native environments. By leveraging advanced programming language techniques, KCL promotes improved modularity, scalability, and stability in configuration management. It simplifies logic writing, offers easy-to-use automation APIs, and seamlessly integrates with existing systems. KCL is short for [Kusion](https://github.com/KusionStack/kusion) Configuration Language, as it was originally developed for the Kusion Platform. It has since been open sourced and made available to manage a wide variety of systems.
 
 ## Why KCL?