Fix lots of broken links in the docs, found by Sphinx' external link checker.
diff --git a/Doc/library/zipimport.rst b/Doc/library/zipimport.rst
index 53eae65..cec6b72 100644
--- a/Doc/library/zipimport.rst
+++ b/Doc/library/zipimport.rst
@@ -35,7 +35,7 @@
.. seealso::
- `PKZIP Application Note <http://www.pkware.com/business_and_developers/developer/appnote/>`_
+ `PKZIP Application Note <http://www.pkware.com/documents/casestudies/APPNOTE.TXT>`_
Documentation on the ZIP file format by Phil Katz, the creator of the format and
algorithms used.