XRC spec: document the "title" property for wxWizard.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74923 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/xrc_format.h

@@ -2015,6 +2015,8 @@ wxWizardPageSimple classes. They both support the following properties
 
 @beginTable
 @hdr3col{property, type, description}
+@row3col{title, @ref overview_xrcformat_type_text,
+    Wizard window's title (default: none).}
 @row3col{bitmap, @ref overview_xrcformat_type_bitmap,
     Page-specific bitmap (default: none).}
 @endTable