Update link to 'A Byte of Python'.

Author: kuyan

docs/intro/learning.rst

@@ -92,7 +92,7 @@ A free introductory book that teaches python at the beginner level, it assumes n
 previous programming experience.
 
     `A Byte of Python for Python 2.x <http://www.ibiblio.org/swaroopch/byteofpython/read/>`_
-    `A Byte of Python for Python 3.x <http://www.swaroopch.org/notes/Python_en:Table_of_Contents>`_
+    `A Byte of Python for Python 3.x <http://swaroopch.com/notes/Python_en-Preface/>`_
 
 
 Advanced