We are in the final stages of creating this part of the documentation, after which it will be displayed on this page.
In the meanwhile you can generate it yourself from the Unbound source:
After ./configure --with-pythonmodule run make doc which builds the documentation in doc/html/pythonmod.
It is also possible to run sphinx-build -b html pythonmod/doc/ doc/html/pythonmod/ without compiling.
The html will end up in the doc/html/pythonmod directory, open index.html with the web browser to see the content.
