fixed doxygen warnings produced by the ifacecheck fixes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56658 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/image.h

@@ -119,6 +119,9 @@ public:
             The image object which is to be affected by this operation.
         @param stream
             Opened output stream for writing the data.
+        @param verbose
+            If set to @true, errors reported by the image handler will produce
+            wxLogMessages.
 
         @return @true if the operation succeeded, @false otherwise.