fixed buglet in wxWindow::GetPosition docs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15823 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/window.tex

@@ -784,8 +784,9 @@ Returns the parent of the window, or NULL if there is no parent.
 
 \constfunc{wxPoint}{GetPosition}{\void}
 
-This gets the position of the window in pixels, relative to the parent window or
-if no parent, relative to the whole display.
+This gets the position of the window in pixels, relative to the parent window
+for the child windows or relative to the display origin for the top level
+windows.
 
 \wxheading{Parameters}