Revert IDL formatting, keep only DismissPopupsRequest event

Author: Nitin Chaudhary

vnext/Microsoft.ReactNative/CompositionComponentView.idl

@@ -85,7 +85,6 @@ CreateInternalVisualDelegate(Microsoft.ReactNative.ComponentView view);
 
   // Issue #15557: Event fired when a parent ScrollView starts scrolling.
   // 3rd party XAML components should subscribe to this event to dismiss any open popups.
-  // Example: comboBox dropdown, DatePicker calendar, Flyouts, etc.
   event Windows.Foundation.EventHandler<IInspectable> DismissPopupsRequest;
 };