Fix DirectML package name in genai/howto/install.md (#20771)

### Description
Fix package name 
from ```dotnet add package Microsoft.ML.OnnxRuntimeGenAI.*Cuda*
--prerelease``` to ```dotnet add package
Microsoft.ML.OnnxRuntimeGenAI.DirectML --prerelease``` in DirectML
section.

### Motivation and Context
Clearly confusing for beginners if not fixed (will break further processes)
This commit is contained in:
Ulrich Bönkemeyer 2024-05-23 13:16:04 -07:00 committed by GitHub
parent 643a16a6bc
commit 4b919fe2ac
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@ -48,7 +48,7 @@ dotnet add package Microsoft.ML.OnnxRuntimeGenAI.Cuda --prerelease
For the package that has been optimized for DirectML:
```bash
dotnet add package Microsoft.ML.OnnxRuntimeGenAI.Cuda --prerelease
dotnet add package Microsoft.ML.OnnxRuntimeGenAI.DirectML --prerelease
```