Remove dotnet#5722 from the known issues

We do have better support so the entry is somewhat misleading

CHANGELOG.md

@@ -3,7 +3,6 @@
 - Diagnostics related feature requests and improvements [#5951](https://github.com/dotnet/vscode-csharp/issues/5951)
 - [O# Parity] FixAll support for code fixes and refactorings [#5735](https://github.com/dotnet/vscode-csharp/issues/5735)
 - [O# Parity] Nuget restore [#5725](https://github.com/dotnet/vscode-csharp/issues/5725)
-- [O# Parity] Support loading projects/files without a solution file [#5722](https://github.com/dotnet/vscode-csharp/issues/5722)
 - [O# Parity] Projects running on Mono may not load correctly [#5721](https://github.com/dotnet/vscode-csharp/issues/5721)
 - [O# Parity] Run and debug tests in context [#5719](https://github.com/dotnet/vscode-csharp/issues/5719)
 - Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)