Fix doxygen warnings.

Using @since inside a style or event list causes doxygen warnings, replace with plain text.

See #15346.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74782 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dirctrl.h

@@ -50,15 +50,18 @@ enum
     @library{wxcore}
     @category{ctrl}
     @appearance{genericdirctrl}
+    
+    @beginEventEmissionTable
     @event{EVT_DIRCTRL_SELECTIONCHANGED(id, func)}
           Selected directory has changed.
           Processes a @c wxEVT_DIRCTRL_SELECTIONCHANGED event type.
           Notice that this event is generated even for the changes done by the
           program itself and not only those done by the user.
-          @since 2.9.5
+          Available since wxWidgets 2.9.5.
     @event{EVT_DIRCTRL_FILEACTIVATED(id, func)}
           The user activated a file by double-clicking or pressing Enter.
-          @since 2.9.5
+          Available since wxWidgets 2.9.5.
+    @endEventTable
 */
 class wxGenericDirCtrl : public wxControl
 {