online documentation page not working as expected

looking to the online documentation for REST api on versions 2.0 and 2.1 at the following links:

https://syncope.apache.org/rest/2.0/index.html
https://syncope.apache.org/rest/2.1/index.html

the page is not working as expected, because the jquery-ui script node on the page refers to a http link of the library:

...

<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script src="http://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<script>
          //
          $(function() {
...

wich causes the browser's (chrome and firefox) refuse to load the script with the following message:

Mixed Content: The page at 'https://syncope.apache.org/rest/2.0/index.html#tabs-33' was loaded over HTTPS, but requested an insecure script 'http://code.jquery.com/ui/1.12.1/jquery-ui.min.js'. This request has been blocked; the content must be served over HTTPS.

and the subsequent exception

Uncaught TypeError: $(...).accordion is not a function
    at HTMLDocument.<anonymous> (index.html:58)
    at e (jquery-3.4.1.min.js:2)
    at t (jquery-3.4.1.min.js:2)

Thank you