Refine documentation related to wxTimePickerCtrl

Specify event types, corresponding to EVT_TIME_CHANGED and
EVT_DATE_CHANGED macros, and update 'see also' sections.

interface/wx/datectrl.h

@@ -70,15 +70,15 @@ enum
 
     @beginEventEmissionTable{wxDateEvent}
     @event{EVT_DATE_CHANGED(id, func)}
-           This event fires when the user changes the current selection in the
-           control.
+           Process a wxEVT_DATE_CHANGED event, which fires when the user
+           changes the current selection in the control.
     @endEventTable
 
     @library{wxcore}
     @category{pickers}
     @appearance{datepickerctrl}
 
-    @see wxCalendarCtrl, wxDateEvent
+    @see wxTimePickerCtrl, wxCalendarCtrl, wxDateEvent
 */
 class wxDatePickerCtrl : public wxControl
 {