Dead links to other documentation

[SittenSpynne]

The links to apparently all external content are dead. I tried the links to INotifyPropertyChanged, ObservableObject, and ObservableRecipient and they're all 404.

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Document Details

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• ID: 1a6763ad-ebef-20ec-906d-0119c7aabc0a
• Version Independent ID: 1a6763ad-ebef-20ec-906d-0119c7aabc0a
• Content: INotifyPropertyChanged attributes - .NET Community Toolkit
• Content Source: docs/mvvm/generators/INotifyPropertyChanged.md
• Product: dotnet-communitytoolkit
• GitHub Login: @Sergio0694
• Microsoft Alias: bramin