Remove "ASP.NET Core" from the ASP.NET Core version selector.

[tdykstra]

See https://github.com/dotnet/AspNetCore.Docs/issues/31773#issuecomment-2916501739

Updated table ........

Current value	New value
ASP.NET Core in .NET 10.0 Preview	.NET 10 Preview
ASP.NET Core in .NET 9.0	.NET 9
ASP.NET Core in .NET 8.0	.NET 8
ASP.NET Core in .NET 7.0	.NET 7
ASP.NET Core in .NET 6.0	.NET 6
ASP.NET Core in .NET 5.0	.NET Core 5.0
ASP.NET Core in .NET 3.1	.NET Core 3.1
ASP.NET Core in .NET 3.0	.NET Core 3.0
ASP.NET Core in .NET 2.2	.NET Core 2.2
ASP.NET Core in .NET 2.1	.NET Core 2.1
ASP.NET Core in .NET 2.0	.NET Core 2.0
ASP.NET Core in .NET 1.1	.NET Core 1.1
ASP.NET Core in .NET 1.0	.NET Core 1.0