The link we have points to the version from Unicode 6.0.0, dated 2010.
There have been numerous updates to it since then:
https://www.unicode.org/reports/tr44/#Modifications
Change the link to one that points to the current version. Also, use HTTPS.
The module uses the same names and symbols as defined by Unicode
Standard Annex #44, `"Unicode Character Database"
-<http://www.unicode.org/reports/tr44/tr44-6.html>`_. It defines the
+<https://www.unicode.org/reports/tr44/>`_. It defines the
following functions: