Fix sample

htdocs/samples/data_hide.html

@@ -16,7 +16,7 @@
             ['data3', 300, 200, 160, 400, 250, 250]
           ],
 //          hide: ['data1', 'data3']
-          hide: false // hide all data
+          hide: true // hide all data
         }
       });
     </script>