CanvasComboBoxFontSizeTextBox add back in tooltip

Author: Rosuavio

Microsoft.Toolkit.Uwp.UI.Controls.Media/InfiniteCanvas/InfiniteCanvas.xaml

@@ -99,7 +99,12 @@
 
                                     <ComboBox x:Name="CanvasComboBoxFontSizeTextBox"
                                               Width="64"
-                                              Height="32" SelectedIndex="9" Margin="0,0,12,0" VerticalAlignment="Center">
+                                              Height="32"
+                                              SelectedIndex="9"
+                                              Margin="0,0,12,0"
+                                              VerticalAlignment="Center"
+                                              ToolTipService.ToolTip="Font Size"
+                                              >
                                         <ComboBoxItem Content="8" />
                                         <ComboBoxItem Content="9" />
                                         <ComboBoxItem Content="10" />