Update links to Python documentation.

Author: kuyan

docs/intro/documentation.rst

@@ -6,8 +6,8 @@ Official Documentation
 
 The official Python Language and Library documentation can be found here:
 
-    - `Python 2.x <http://docs.python.org/2.7/>`_
-    - `Python 3.x <http://docs.python.org/py3k/>`_
+    - `Python 2.x <https://docs.python.org/2/>`_
+    - `Python 3.x <https://docs.python.org/3/>`_
 
 
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