Move MVVMTK0056 to 8.4.0 release

Author: Sergio0694

src/CommunityToolkit.Mvvm.SourceGenerators/AnalyzerReleases.Shipped.md

@@ -97,11 +97,4 @@ MVVMTK0052 | CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator
 MVVMTK0053 | CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Error | See https://aka.ms/mvvmtoolkit/errors/mvvmtk0053
 MVVMTK0054 | CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Error | See https://aka.ms/mvvmtoolkit/errors/mvvmtk0054
 MVVMTK0055 | CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Error | See https://aka.ms/mvvmtoolkit/errors/mvvmtk0055
-
-## Release 8.4.1
-
-### New Rules
-
-Rule ID | Category | Severity | Notes
---------|----------|----------|-------
 MVVMTK0056 | CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Info | See https://aka.ms/mvvmtoolkit/errors/mvvmtk0056