added wxTBK_HORZ_LAYOUT (heavily modified patch 1855678)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51214 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/toolbook.tex

@@ -41,9 +41,11 @@ wxBookCtrlBase (see \helpref{wxBookCtrl overview}{wxbookctrloverview})\\
 
 \twocolwidtha{5cm}
 \begin{twocollist}\itemsep=0pt
-
 \twocolitem{\windowstyle{wxBK\_DEFAULT}}{Choose the default location for the
 labels depending on the current platform (currently always the top).}
+\twocolitem{\windowstyle{wxTBK\_HORZ\_LAYOUT}}{Shows the text and the icons
+alongside, not vertically stacked (only implement under Windows and GTK 2
+platforms as it relies on \texttt{wxTB\_HORZ\_LAYOUT} flag support).}
 \end{twocollist}
 
 \wxheading{See also}