Document /uninstall and /repair options for .NET (#43677)

* Document /uninstall and /repair options for .NET

* Update docs/core/install/windows.md

Co-authored-by: Andy (Steve) De George <[email protected]>

* Fix lint error

---------

Co-authored-by: Andy (Steve) De George <[email protected]>

Author: joeloff

docs/core/install/windows.md

@@ -216,6 +216,14 @@ Suppresses any attempts to restart.
 dotnet-sdk-9.0.100-win-x64.exe /install /quiet /norestart
 ```
 
+If you've already installed .NET, use the .NET Installer to manage the installation. Instead of `/install`, use one of the following options:
+
+- `/uninstall`\
+Remove this version of .NET.
+
+- `/repair`\
+Check if the installations key files or components are damaged and restore them.
+
 > [!TIP]
 > The installer returns an exit code of **0** for success and an exit code of **3010** to indicate that a restart is required. Any other value is most likely an error code.