Added "uninstall old cli section"

docs/en/cli/index.md

@@ -3,6 +3,8 @@
 ABP CLI (Command Line Interface) is a command line tool to perform some common operations for ABP based solutions or ABP Studio features.
 
 > 🛈 With **v8.2+**, the old/legacy ABP CLI has been replaced with a new CLI system to align with the new templating system and [ABP Studio](../studio/index.md). The new ABP CLI commands are explained in this documentation. However, if you want to learn more about the differences between the old and new CLIs, want to learn the reason for the change, or need guidance to use the old ABP CLI, please refer to the [Old vs New CLI](differences-between-old-and-new-cli.md) documentation.
+>
+> You may need to remove the Old CLI before installing the New CLI, by running the following command: `dotnet tool uninstall -g Volo.Abp.Cli`
 
 ## Installation