Add wxStyledTextCtrl XRC handler

Closes https://github.com/wxWidgets/wxWidgets/pull/2530

Co-authored-by: VZ <vz-github@zeitlins.org>

docs/doxygen/overviews/xrc_format.h

@@ -2110,6 +2110,26 @@ No additional properties.
      wxStaticText::Wrap() (default: no wrap).}
 @endTable
 
+@subsubsection xrc_wxstyledtextctrl wxStyledTextCtrl
+
+@beginTable
+@hdr3col{property, type, description}
+@row3col{wrapmode, @ref overview_xrcformat_type_style,
+    Set wrapmode to wxSTC_WRAP_WORD to enable wrapping on word or style boundaries,
+    wxSTC_WRAP_CHAR to enable wrapping between any characters, wxSTC_WRAP_WHITESPACE
+    to enable wrapping on whitespace, and wxSTC_WRAP_NONE to disable line wrapping
+    (default: wxSTC_WRAP_NONE).}
+@endTable
+
+Notice that wxStyledTextCtrl support in XRC is available in wxWidgets 3.1.6 and
+later only and you need to explicitly register its handler using
+@code
+    #include <wx/xrc/xh_styledtextctrl.h>
+
+    AddHandler(new wxStyledTextCtrl);
+@endcode
+to use it.
+
 @subsubsection xrc_wxtextctrl wxTextCtrl
 
 @beginTable