Merge pull request #1777 from bartlannoeye/Issue-1754

Corrected code comment

Author: American-Dipper

windows-apps-src/design/layout/layouts-with-xaml.md

@@ -201,7 +201,7 @@ This example does the same thing as the previous example, but uses the simplifie
                 <VisualState>
                     <VisualState.StateTriggers>
                         <!-- VisualState to be triggered when the
-                             window width is >=720 effective pixels. -->
+                             window width is >=640 effective pixels. -->
                         <AdaptiveTrigger MinWindowWidth="640" />
                     </VisualState.StateTriggers>