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remove the description about the polyfill for union #10449

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remove the description about the polyfill for union #10449

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14 changes: 0 additions & 14 deletions release-notes/11.0/preview/preview5/csharp.md
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Expand Up @@ -67,20 +67,6 @@ Union rules in this preview:

The compiler also recognizes hand-authored union types marked with `System.Runtime.CompilerServices.UnionAttribute`, including union members supplied by a nested `IUnionMembers` provider interface ([dotnet/roslyn #83048](https://github.com/dotnet/roslyn/pull/83048), [dotnet/roslyn #83208](https://github.com/dotnet/roslyn/pull/83208)).

In this preview, projects that declare unions need the compiler support types available to the compilation:

```csharp
namespace System.Runtime.CompilerServices;

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = false)]
public sealed class UnionAttribute : Attribute { }

public interface IUnion
{
object? Value { get; }
}
```

## Unsafe Evolution

> This is a preview feature for .NET 11.
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