Add more necessary information

Author: Euugi

reference/forms/types/time.rst

@@ -82,6 +82,9 @@ values for the hour, minute and second fields::
         ],
     ]);
 
+If you want seconds to be displayed as well, take a look at the setting 
+`with_seconds`_, which is by default set to false.
+
 .. include:: /reference/forms/types/options/hours.rst.inc
 
 .. include:: /reference/forms/types/options/html5.rst.inc