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/gdicmn.h

@@ -723,7 +723,7 @@ public:
         to scale both dimensions by the same factor you can also use
         operator*=().
 
-        @returns A reference to this object (so that you can concatenate other
+        @return A reference to this object (so that you can concatenate other
                  operations in the same line).
     */
     wxSize& Scale(float xscale, float yscale);