chore(chart): fix enum name in breaking changes list

Author: marin-bratanov

upgrade/breaking-changes/2-0-0.md

@@ -44,7 +44,7 @@ Some enums had to move to different namespaces and/or to have more descriptive n
 
 ````CSHTML
 // Chart
-Telerik.Blazor.ChartSeriesStack.Stack100 -> Telerik.Blazor.ChartSeriesStackType.Stack100
+Telerik.Blazor.ChartSeriesStack -> Telerik.Blazor.ChartSeriesStackType
 
 // Grid
 Telerik.Blazor.FilterMode -> Telerik.Blazor.GridFilterMode