Improve the doc of Microsoft.Extensions.Configuration.Configurationbinder.Getvalue

[tarekgh]

Need to clarify the behavior of the extension methods `IConfiguration.GetValue to explain how these API read the configuration and convert it to type. It is worth explaining how these APIs differ than other configuration binding APIs. Look at the issue dotnet/runtime#103418 for more discussions around that.

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I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-extensions-configuration