Update last tix code example for 3.x, as already done for previous examples.
diff --git a/Doc/library/tkinter.tix.rst b/Doc/library/tkinter.tix.rst
index cc7ffd1..289bffd 100644
--- a/Doc/library/tkinter.tix.rst
+++ b/Doc/library/tkinter.tix.rst
@@ -499,8 +499,8 @@
 
    To view the current settings, the common usage is::
 
-      import Tix
-      root = Tix.Tk()
+      from tkinter import tix
+      root = tix.Tk()
       print(root.tix_configure())