Fix broken link in winui3_migration.md (#6312)

Fix broken links.
Link specifically to WinUI feature

docs/winui3_migration.md

@@ -1,7 +1,7 @@
 # Migrating a UWP App To WinUI3
 
-**It is recommended to use the  [try-convert](https://github.com/dotnet/try-convert/blob/feature/winui) tool for the full conversion process.**
-**[try-convert](https://github.com/dotnet/try-convert/blob/feature/winui) will automate most of the conversion steps.**
+**It is recommended to use the [try-convert](https://github.com/dotnet/try-convert/tree/feature/winui) tool for the full conversion process.**
+**try-convert will automate most of the conversion steps.**
 
 ## Background
 
@@ -18,4 +18,4 @@ This porting assistance is provided in the form of Roslyn Analyzers and Code Fix
 - A Code Analyzer provides on the fly code inspections for C# and creates diagnostics. 
 - A Code Fix consumes the diagnostics created by the Code Analyzer and modifies the C# file in-line. 
 
-See the [try-convert documentation](https://github.com/dotnet/try-convert/blob/feature/winui) for more information on these code analyzers and how to automoate the process with [try-convert](https://github.com/dotnet/try-convert/blob/feature/winui/WinUIConvert.md).
+See the [try-convert documentation](https://github.com/dotnet/try-convert/blob/feature/winui/WinUIConvert.md) for more information on these code analyzers and how to automoate the process with try-convert.