Modified CloseReason.UserClosing (#3085)

Author: Ron Petrusha

xml/System.Windows.Forms/CloseReason.xml

@@ -152,7 +152,7 @@
       </ReturnValue>
       <MemberValue>3</MemberValue>
       <Docs>
-        <summary>The user is closing the form through the user interface (UI), for example by clicking the **Close** button on the form window, selecting **Close** from the window's control menu, or pressing ALT+F4.</summary>
+        <summary>The form is closing either programmatically or through a user action in the user interface (for example, by clicking the **Close** button on the form window, selecting **Close** from the window's control menu, or pressing ALT+F4).</summary>
       </Docs>
     </Member>
     <Member MemberName="WindowsShutDown">