Rename title, add links for 2.7.3 and 3.3

Author: vishalsodani

docs/intro/learning.rst

@@ -223,7 +223,7 @@ Python 3 and 2.6 versions.
 
     `Python Pocket Reference <http://shop.oreilly.com/product/9780596158095.do>`_
 
-Writing Idiomatic Python 2.7.3
+Writing Idiomatic Python
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 "Writing Idiomatic Python", written by Jeff Knupp, contains the most common and
@@ -232,6 +232,8 @@ Each idiom is presented as a recommendation to write some commonly used piece of
 It is followed by an explanation of why the idiom is important. It also contains two 
 code samples: the "Harmful" way to write it and the "Idiomatic" way
 
-	`Writing Idiomatic Python 2.7.3 <http://www.amazon.com/Writing-Idiomatic-Python-2-7-3-Knupp/dp/1482372177/>`_
+	`For Python 2.7.3+ <http://www.amazon.com/Writing-Idiomatic-Python-2-7-3-Knupp/dp/1482372177/>`_
+	
+	`For Python 3.3+  <http://www.amazon.com/Writing-Idiomatic-Python-Jeff-Knupp-ebook/dp/B00B5VXMRG/>`_