Added a comment explaining the commented-out code.

Author: grokys

src/GitHub.InlineReviews/Views/CommentView.xaml

@@ -71,7 +71,11 @@
                 </Border>
               </StackPanel>
 
-              <!--
+              <!-- 
+                Temporarily removed because the REST API doesn't yet support deleting pending comments
+                and there's no GraphQL API for deleting comments at all. Can re-enable once the REST API
+                is fixed.
+                
               <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" DockPanel.Dock="Right"
                           Visibility="{Binding CanDelete, Converter={ui:BooleanToVisibilityConverter}}">
                 <ui:OcticonButton Command="{Binding BeginEdit}"