Link time delta index docs to better matplotlib docs.

Author: jgoppert

doc/source/visualization.rst

@@ -1253,7 +1253,7 @@ tick locator methods, it is useful to call the automatic
 date tick adjustment from matplotlib for figures whose ticklabels overlap.
 
 See the :meth:`autofmt_xdate <matplotlib.figure.autofmt_xdate>` method and the
-`matplotlib documentation <http://matplotlib.org/api/figure_api.html#matplotlib.figure.Figure.autofmt_xdate>`__ for more.
+`matplotlib documentation <http://matplotlib.org/users/recipes.html#fixing-common-date-annoyances>`__ for more.
 
 Subplots
 ~~~~~~~~