Fix lots of broken links in the docs, found by Sphinx' external link checker.
diff --git a/Doc/reference/introduction.rst b/Doc/reference/introduction.rst
index 5481043..8b2cceb 100644
--- a/Doc/reference/introduction.rst
+++ b/Doc/reference/introduction.rst
@@ -59,7 +59,7 @@
This implementation actually uses the CPython implementation, but is a managed
.NET application and makes .NET libraries available. It was created by Brian
Lloyd. For more information, see the `Python for .NET home page
- <http://www.zope.org/Members/Brian/PythonNet>`_.
+ <http://pythonnet.sourceforge.net>`_.
IronPython
An alternate Python for .NET. Unlike Python.NET, this is a complete Python