Minor suggestion: updated migration messaging in msal-net-migration.md

[nickwalkmsft]

I'm in a mail thread discussing how retired ADAL.NET ref docs should get redirected, where the leading suggestion is https://learn.microsoft.com/en-us/entra/msal/dotnet/how-to/msal-net-migration.

That page is great but the messaging above the fold is a bit outdated - it could benefit from clearly stating that ADAL is EOL like this and this, less of "look at these convincing features" and more "ADAL is very dead, you really need to move."

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Document Details

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• ID: 896435a1-8b3d-a29c-5e12-b5f11a601b8d
• Version Independent ID: 896435a1-8b3d-a29c-5e12-b5f11a601b8d
• Content: Migrating to MSAL.NET and Microsoft.Identity.Web - Microsoft Authentication Library for .NET
• Content Source: msal-dotnet-articles/how-to/msal-net-migration.md
• Service: msal
• Sub-service: msal-dotnet
• GitHub Login: @Dickson-Mwendia
• Microsoft Alias: dmwendia