Fixed typo noted by Guido Kollerie <gkoller@cs.vu.nl> in example code.
diff --git a/Doc/lib/liburllib.tex b/Doc/lib/liburllib.tex
index 38ee09e..c781ebc 100644
--- a/Doc/lib/liburllib.tex
+++ b/Doc/lib/liburllib.tex
@@ -173,7 +173,7 @@
         apply(urllib.FancyURLopener.__init__, (self,) + args)
         self.version = "App/1.7"
 
-urllib._urlopener = AppURLopener
+urllib._urlopener = AppURLopener()
 \end{verbatim}
 
 \begin{classdesc}{URLopener}{\optional{proxies\optional{, **x509}}}