use wxDP_SPIN by default under Win32

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31500 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/datectrl.tex

@@ -40,7 +40,8 @@ components. This style is not supported by the generic version.}
 \twocolitem{\windowstyle{wxDP\_DROPDOWN}}{Creates a control with a month
 calendar drop down part from which the user can select a date.}
 \twocolitem{\windowstyle{wxDP\_DEFAULT}}{Creates a control with default style
-which is the best supported for the current platform.}
+which is the best supported for the current platform (currently wxDP\_SPIN
+under Windows and wxDP\_DROPDOWN elsewhere).}
 \end{twocollist}
 
 \wxheading{Event handling}