add more references to the delayed deletion of wxTopLevelWindows

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56959 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/frame.h

@@ -165,6 +165,8 @@ public:
 
     /**
         Destructor. Destroys all child windows and menu bar if present.
+
+        See @ref overview_windowdeletion for more info.
     */
     virtual ~wxFrame();