Fix a11y issue on InfoBadge sample (microsoft#1310)

* Add tooltip to fix a11y issue

* Fix sample code

* Fix faulty formatting and icon

Author: marcelwgn

WinUIGallery/ControlPages/InfoBadgePage.xaml

@@ -99,12 +99,13 @@
 
         <local:ControlExample x:Name="Example3" HeaderText="Placing an InfoBadge Inside Another Control" HorizontalContentAlignment="Stretch" >
             <local:ControlExample.Example>
-                <Button Padding="0" Width="200" Height="60" HorizontalAlignment="Center" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
+                <Button Padding="0" Width="200" Height="60" ToolTipService.ToolTip="Refresh required"
+                        HorizontalAlignment="Center" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
                     <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto">
                         <SymbolIcon Symbol="Sync" HorizontalAlignment="Center"/>
                         <InfoBadge Background="#C42B1C" HorizontalAlignment="Right" VerticalAlignment="Top">
                             <InfoBadge.IconSource>
-                                <FontIconSource FontFamily="{StaticResource SymbolThemeFontFamily}" Glyph="&#xF13C;"/>
+                                <FontIconSource FontFamily="{StaticResource SymbolThemeFontFamily}" Glyph="&#xF13C;" />
                             </InfoBadge.IconSource>
                         </InfoBadge>
                     </Grid>
@@ -114,12 +115,13 @@
 
             <local:ControlExample.Xaml>
                 <x:String xml:space="preserve">
-&lt;Button Padding="0" Width="200" Height="60" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"&gt;
+&lt;Button Padding="0" Width="200" Height="60" ToolTipService.ToolTip="Refresh required"
+        HorizontalAlignment="Center" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"&gt;
     &lt;Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto"&gt;
         &lt;SymbolIcon Symbol="Sync" HorizontalAlignment="Center"/&gt;
         &lt;InfoBadge Background="#C42B1C" HorizontalAlignment="Right" VerticalAlignment="Top"&gt;
             &lt;InfoBadge.IconSource&gt;
-                &lt;FontIconSource FontFamily={StaticResource SymbolThemeFontFamily} Glyph="&#xF13C;" /&gt;
+                &lt;FontIconSource FontFamily="{StaticResource SymbolThemeFontFamily}" Glyph="&#xF13C;" /&gt;
             &lt;/InfoBadge.IconSource&gt;
         &lt;/InfoBadge&gt;
     &lt;/Grid&gt;