added PR link

Author: Jordi Ramos

CHANGELOG.md

@@ -4,7 +4,7 @@
 - Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)
 
 # 2.57.x
-* Update Razor to 9.0.0-preview.24565.1 (PR: [#])
+* Update Razor to 9.0.0-preview.24565.1 (PR: [#7793])(https://github.com/dotnet/vscode-csharp/pull/7793)
 * Update Razor to 9.0.0-preview.24561.3 (PR: [#7748](https://github.com/dotnet/vscode-csharp/pull/7748))
   * Add feature flag to turn on the new Roslyn tokenizer (PR: [#11185](https://github.com/dotnet/razor/pull/11185))
 * Bump xamltools to 17.13.35513.19 (PR: [#7777](https://github.com/dotnet/vscode-csharp/pull/7777))