Update README.md (#9311)

Fix URI

README.md

@@ -103,7 +103,7 @@ For WinUI 3, your app's users must be on Windows 10 1809 - Build 17763 or newer
 For info on the WinUI release schedule and high level plans please see the [Windows UI Library Roadmap](docs/roadmap.md).
 
 ## WinUI 3 is a part of the Windows App SDK family
-The [Windows App SDK](https://github.com/microsoft/ProjectReunion) is a set of libraries, frameworks, components, and tools that you can use in your apps to access powerful Windows platform functionality from all kinds of apps on many versions of Windows. The Windows App SDK combines the powers of Win32 native applications alongside modern API usage techniques, so your apps light up everywhere your users are. 
+The [Windows App SDK](https://github.com/microsoft/WindowsAppSDK) is a set of libraries, frameworks, components, and tools that you can use in your apps to access powerful Windows platform functionality from all kinds of apps on many versions of Windows. The Windows App SDK combines the powers of Win32 native applications alongside modern API usage techniques, so your apps light up everywhere your users are. 
 
 Other Windows App SDK components are: [WebView2](https://docs.microsoft.com/microsoft-edge/webview2/),  [MSIX (MSIX-Core)](https://docs.microsoft.com/windows/msix/overview), [C++/WinRT](https://github.com/microsoft/cppwinrt), [Rust/WinRT](https://github.com/microsoft/winrt-rs), and [C#/WinRT](https://github.com/microsoft/cswinrt). If you'd like to learn more and contribute to Windows App SDK, or have **UWP/app model related questions**, visit our [Github repo](https://github.com/microsoft/WindowsAppSDK).