using anonymous hyperlinks to avoid duplicate explicit name warnings

see: http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#anonymous-hyperlinks

Author: andrewmacgregor

docs/scenarios/db.rst

@@ -10,8 +10,8 @@ Nearly all Python database modules such as `sqlite3`, `psycopg` and
 `mysql-python` conform to this interface.
 
 Tutorials that explain how to work with modules that conform to this interface can be found
-`here <http://halfcooked.com/presentations/osdc2006/python_databases.html>`_ and
-`here <http://www.amk.ca/python/writing/DB-API.html>`_.
+`here <http://halfcooked.com/presentations/osdc2006/python_databases.html>`__ and
+`here <http://www.amk.ca/python/writing/DB-API.html>`__.
 
 SQLAlchemy
 ----------