Replaced @returns with @return for more standard command use and compatibility.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/validate.h

@@ -63,7 +63,7 @@ public:
         brushes, it does not make sense to have a reference counting scheme to
         do this cloning because all validators should have separate data.
 
-        @returns This base function returns @NULL.
+        @return This base function returns @NULL.
     */
     virtual wxObject* Clone() const;