Switch branch name to main in analyzer files

Co-authored-by: Michael Hawker MSFT (XAML Llama) <[email protected]>

Author: Sergio0694

Microsoft.Toolkit.Mvvm.SourceGenerators/AnalyzerReleases.Shipped.md

@@ -1,3 +1,2 @@
 ; Shipped analyzer releases
-; https://github.com/dotnet/roslyn-analyzers/blob/master/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md
-
+; https://github.com/dotnet/roslyn-analyzers/blob/main/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md

Microsoft.Toolkit.Mvvm.SourceGenerators/AnalyzerReleases.Unshipped.md

@@ -1,5 +1,5 @@
 ; Unshipped analyzer release
-; https://github.com/dotnet/roslyn-analyzers/blob/master/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md
+; https://github.com/dotnet/roslyn-analyzers/blob/main/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md
 
 ### New Rules
 
@@ -16,4 +16,4 @@ MVVMTK0008 | Microsoft.Toolkit.Mvvm.SourceGenerators.ObservableRecipientGenerato
 MVVMTK0009 | Microsoft.Toolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Error | See https://aka.ms/mvvmtoolkit
 MVVMTK0010 | Microsoft.Toolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Error | See https://aka.ms/mvvmtoolkit
 MVVMTK0011 | Microsoft.Toolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator | Error | See https://aka.ms/mvvmtoolkit
-MVVMTK0012 | Microsoft.Toolkit.Mvvm.SourceGenerators.ICommandGenerator | Error | See https://aka.ms/mvvmtoolkit
+MVVMTK0012 | Microsoft.Toolkit.Mvvm.SourceGenerators.ICommandGenerator | Error | See https://aka.ms/mvvmtoolkit