Add comment about resource value which is hard-coded in code-behind for initial value of TokenizingTextBoxItem

Author: michael-hawker

Microsoft.Toolkit.Uwp.UI.Controls/TokenizingTextBox/TokenizingTextBox.xaml

@@ -12,7 +12,7 @@
     <Thickness x:Key="TokenizingTextBoxPresenterMargin">0,0,6,0</Thickness>
     <x:Double x:Key="TokenizingTextBoxTokenSpacing">2</x:Double>
     <Thickness x:Key="TextControlBorderThemeThicknessFocused">2</Thickness>
-    <x:Double x:Key="TokenizingTextBoxIconFontSize">16</x:Double>
+    <x:Double x:Key="TokenizingTextBoxIconFontSize">16</x:Double> <!-- 'Example' hard-coded currently in link:TokenizingTextBoxItem.AutoSuggestBox.cs#L110, but can be overwritten in developer's resources as 'normal' -->
 
     <controls:TokenizingTextBoxStyleSelector x:Key="TokenizingTextBoxStyleSelector"
                                              TextStyle="{StaticResource TokenizingTextBoxItemTextStyle}"