Skip doctesting of module docstring.

In this case it is just an illustrative example and not an actual
doctest.

IPython/extensions/autoreload.py

@@ -89,6 +89,8 b' Some of the known remaining caveats are:'
 
 """
 
+skip_doctest = True
+
 # Pauli Virtanen <[e-mail]>, 2008.
 # Thomas Heller, 2000.
 #