Add Entra identity platform code samples link to landing page (#36918)

* Initial plan

* Add Entra identity platform code samples link to Samples section

Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>
Agent-Logs-Url: https://github.com/dotnet/AspNetCore.Docs/sessions/8c5f3f1b-aefd-4b26-b90c-e8135017a760

* Apply suggestion from @wadepickett

* Update references to Microsoft Entra ID in documentation

* Remove ms.custom metadata from index.md

Removed 'ms.custom' metadata from the index file.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>
Co-authored-by: Wade Pickett <wpickett@microsoft.com>

Author: Copilot

aspnetcore/security/authentication/azure-active-directory/index.md

@@ -1,15 +1,15 @@
 ---
 title: Microsoft identity platform and Microsoft Entra ID with ASP.NET Core
+ai-usage: ai-assisted
 author: wpickett
-description: Discover topics related to authentication with Microsoft identity platform Microsoft Entra ID for web apps and APIs in ASP.NET Core.
+description: Discover topics related to authentication with Microsoft identity platform and Microsoft Entra ID for web apps and APIs in ASP.NET Core.
 ms.author: wpickett
-ms.date: 01/22/2026
-ms.custom: mvc
+ms.date: 03/25/2026
 uid: security/authentication/azure-active-directory/index
 ---
 # Microsoft Entra ID with ASP.NET Core
 
-These tutorials and samples demonstrate authentication in ASP.NET Core using Microsoft identity platform and Microsoft Entra ID. For additional tutorials and samples using ASP.NET Core with Azure AD, see [Microsoft identity platform](/azure/active-directory/develop/).
+These tutorials and samples demonstrate authentication in ASP.NET Core using Microsoft identity platform and Microsoft Entra ID. For additional tutorials and samples using ASP.NET Core with Microsoft Entra ID, see [Microsoft identity platform](/azure/active-directory/develop/).
 
 ## Application Scenarios
 
@@ -22,3 +22,4 @@ These tutorials and samples demonstrate authentication in ASP.NET Core using Mic
 ## Samples
 
 * [Enable your ASP.NET Core app to sign-in users and call web APIs using Microsoft identity platform for developers](https://github.com/Azure-Samples/active-directory-aspnetcore-webapp-openidconnect-v2/)
+* [Microsoft identity platform code samples](/entra/identity-platform/sample-v2-code): Microsoft Entra documentation's full code samples page, which covers common scenarios, including web apps and web APIs.