Update Window.xml (#10068)

Formatting fix

Author: nnpcYvIVl

xml/System.Windows/Window.xml

@@ -674,7 +674,7 @@ The following example shows a **File** > **Exit** menu being handled to explicit
 
  By default, a dialog box is canceled when a user does one of the following:
 
--   PressesALT+F4.
+-   Presses ALT+F4.
 
 -   Clicks the **Close** button.