little tweaks

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28633 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/docs/MigrationGuide.html

@@ -787,7 +787,7 @@ new Navigate method in the wx.Window class to help send the event and
 it is used something like this:</p>
 <pre class="literal-block">
 flags = wx.NavigationKeyEvent.IsForward
-if event.ShiftDown:
+if event.ShiftDown():
     flags = wx.NavigationKeyEvent.IsBackward
 if event.ControlDown():
     flags |= wx.NavigationKeyEvent.WinChange