Update AI samples link to Microsoft Learn

Replaced the outdated GitHub link for 'AI Samples for .NET' with the official Microsoft Learn samples page in both Microsoft.Extensions.AI and Semantic Kernel documentation.

docs/en/framework/infrastructure/artificial-intelligence/microsoft-extensions-ai.md

@@ -173,4 +173,4 @@ public class MyProjectModule : AbpModule
 ## See Also
 
 - [Usage of Semantic Kernel](./microsoft-semantic-kernel.md)
-- [AI Samples for .NET](https://github.com/microsoft/ai-samples): Microsoft's AI samples for .NET
+- [AI Samples for .NET](https://learn.microsoft.com/en-us/samples/dotnet/ai-samples/ai-samples/)

docs/en/framework/infrastructure/artificial-intelligence/microsoft-semantic-kernel.md

@@ -132,4 +132,4 @@ public class MyProjectModule : AbpModule
 ## See Also
 
 - [Usage of Microsoft.Extensions.AI](./microsoft-extensions-ai.md)
-- [AI Samples for .NET](https://github.com/microsoft/ai-samples): Microsoft's AI samples for .NET
+- [AI Samples for .NET](https://learn.microsoft.com/en-us/samples/dotnet/ai-samples/ai-samples/)