fix site name

Author: mhmohona

doc/source/contributing.rst

@@ -75,7 +75,7 @@ Some great resources for learning Git:
 
     * the `GitHub help pages <http://help.github.com/>`_.
     * the `NumPy's documentation <http://docs.scipy.org/doc/numpy/dev/index.html>`_.
-    * Matthew Brett's `The curious coder’s guide to git <https://matthew-brett.github.io/pydagogue/>`_.
+    * Matthew Brett's `Pydagogue <https://matthew-brett.github.io/pydagogue/>`_.
 
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 Getting started with Git