Fix block quote

Author: serra

docs/intro/learning.rst

@@ -209,8 +209,10 @@ in Python. Magic methods are surrounded by double underscores (i.e. __init__)
 and can make classes and objects behave in different and magical ways.
 
     `A Guide to Python's Magic Methods <http://www.rafekettler.com/magicmethods.html>`_
+
 .. note:: The Rafekettler.com is currently down, you can go to their Github version directly. Here you can find a PDF version:
     `A Guide to Python's Magic Methods (repo on GitHub) <https://github.com/RafeKettler/magicmethods/blob/master/magicmethods.pdf>`_
+    
 
 
 For Engineers and Scientists