typo fix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52925 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/app.h

@@ -665,7 +665,7 @@ public:
     This is used in headers to create a forward declaration of the wxGetApp()
     function implemented by IMPLEMENT_APP().
 
-    It creates the declaration @a className wxGetApp(void).
+    It creates the declaration <tt>className& wxGetApp()</tt>.
 
     @header{wx/app.h}