Update Azure Active Directory documentation

# Issue description

In .NET 5.0 we have switched from using V1 AAD APIs to using Microsoft.Identity.Web as part of addressing https://github.com/dotnet/aspnetcore/issues/22726. Our templates have been updated to use `Microsoft.Identity.Web` and `Microsoft.Identity.Web.UI` instead of the obsolete `Microsoft.AspNetCore.Authentication.AzureAD.UI` and `Microsoft.AspNetCore.Authentication.AzureADB2C.UI`. We should update our documentation in this area to reflect the new APIs, see https://docs.microsoft.com/en-us/aspnet/core/security/authentication/azure-active-directory/

# Software versions

Check the .NET target framework(s) being used, and include the version number(s).

- [x] .NET Core (.NET 5 covers both)
- [x] .NET Framework (.NET 5 covers both)
- [ ] .NET Standard

If using the .NET Core SDK, include `dotnet --info` output. If using .NET Framework without the .NET Core SDK, include info from Visual Studio's **Help** > **About Microsoft Visual Studio** dialog.

dotnet --info output or About VS info

```console

```

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#### Document Details

⚠ *Do not edit this section. It is required for learn.microsoft.com ➟ GitHub issue linking.*

* ID: 7bdae773-368b-a0c1-64d0-2a7b8c8fb134
* Version Independent ID: 2816eb27-7fc5-19e6-7f79-7e81a388647f
* Content: [Microsoft identity platform and Azure Active Directory with ASP.NET Core](https://learn.microsoft.com/en-us/aspnet/core/security/authentication/azure-active-directory/?view=aspnetcore-6.0)
* Content Source: [aspnetcore/security/authentication/azure-active-directory/index.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/azure-active-directory/index.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-security**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **riande**