Fix links in changelog

Author: dibarbet

CHANGELOG.md

@@ -4,8 +4,8 @@
 - Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)
 
 ## Latest
-* Add oboslete classification definitions to vs2019 themes (PR: [#<>](https://github.com/dotnet/vscode-csharp/pull/<>))
-* Bump Roslyn to 4.11.0-1.24179.11 (PR: [#<>](https://github.com/dotnet/vscode-csharp/pull/<>))
+* Add oboslete classification definitions to vs2019 themes (PR: [#7011](https://github.com/dotnet/vscode-csharp/pull/7011))
+* Bump Roslyn to 4.11.0-1.24179.11 (PR: [#7011](https://github.com/dotnet/vscode-csharp/pull/7011))
   * Add feature to strike out obsolete symbols (PR: [#72156](https://github.com/dotnet/roslyn/pull/72156))
   * Fix issue where some file changes would be ignored on Windows due to casing (PR: [#72555](https://github.com/dotnet/roslyn/pull/72555))
   * Drop win32-ia32 language server support (PR: [#72605](https://github.com/dotnet/roslyn/pull/72605))