Broken link in Appendix H.3

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.4/external-pl.html
Description:

At https://www.postgresql.org/docs/9.4/external-pl.html, the link to PL/Py
is broken. Specifically, the link shown is
http://python.projects.postgresql.org/backend/, which redirects to
http://python.projects.pgfoundry.org/backend/ and returns 404. I don't know
what the correct link should be, if any.