More complete example of OnPropertyChanged

[eyohansa]

Can an example of, how the FullName property mentioned in OnPropertyChanged would look like, be included in this page? I can't seem to find an example in the Sample App as well.

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• ID: baa399f1-fe73-add4-df84-b99a29fb4083
• Version Independent ID: baa399f1-fe73-add4-df84-b99a29fb4083
• Content: ObservableProperty attribute - .NET Community Toolkit
• Content Source: docs/mvvm/generators/ObservableProperty.md
• Product: dotnet-communitytoolkit
• GitHub Login: @Sergio0694
• Microsoft Alias: bramin