add alignment flags support to wxSpinCtrl[Double] (closes #10621)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59719 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/spinctrl.h

@@ -21,6 +21,13 @@
         events. Using this style will prevent the user from using the Enter key
         for dialog navigation (e.g. activating the default button in the
         dialog) under MSW.
+    @style{wxTE_LEFT}
+        Same as for wxTextCtrl: the text is left aligned.
+    @style{wxTE_CENTER}
+        Same as for wxTextCtrl: the text is centered.
+    @style{wxTE_RIGHT}
+        Same as for wxTextCtrl: the text is right aligned (this is the
+        default).
     @endStyleTable