Update Microsoft Entra credentials link to dedicated how-to article

[Copilot]

The "Create a client secret" section linked to a fragment within the quickstart guide (/entra/identity-platform/quickstart-register-app?tabs=client-secret#add-credentials). Microsoft has a dedicated how-to article for this content.

Changes

• Updated link to /entra/identity-platform/how-to-add-credentials in both moniker ranges (aspnetcore-6.0+ and aspnetcore-3.1)
• Updated ms.date metadata per repository guidelines

Original prompt

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This section details on the original issue you should resolve

<issue_title>Incorrect link</issue_title>
<issue_description>### Description

The "Create a client secret" section has a link: Register an application with the Microsoft identity platform: Add Credentials

I believe the correct page is https://learn.microsoft.com/en-us/entra/identity-platform/how-to-add-credentials

Page URL

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/social/microsoft-logins?view=aspnetcore-8.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/social/microsoft-logins.md

Document ID

ce69b990-0b4c-abda-cd2d-68f85cd8031e

Platform Id

c1bb804d-a454-af4f-b074-976f71ffb606

Article author

@tdykstra

Metadata

• ID: a4c264c0-0c5c-298e-bb45-9b4891c8d162
• PlatformId: c1bb804d-a454-af4f-b074-976f71ffb606
• Service: aspnet-core
• Sub-service: security

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Incorrect link #36497

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Internal previews

📄 File	🔗 Preview link
aspnetcore/security/authentication/social/microsoft-logins.md	Microsoft Account external login setup with ASP.NET Core