Merge pull request #615 from JokkeeZ/patch-1

fix: remove extra '<' from StackPanel tag

Author: maxkatz6

docs/reference/controls/border.md

@@ -87,7 +87,7 @@ If both offset values are set to zero, the shadow is placed behind the element,
 This is an example of a drop-shadow:
 
 ```xml
-<<StackPanel>
+<StackPanel>
   <Border Background="Gainsboro"
         BorderBrush="Black"
         BorderThickness="2"