"General Functions" link on this page doesn't open the list of general functions and their documentation:
This link: https://pyjanitor-devs.github.io/pyjanitor/api/functions/
and this link: https://pyjanitor-devs.github.io/pyjanitor/api/functions/#janitor.functions--general-functions
display same page.
All other "API Reference" subsection links--Biology, Chemistry, Engineering, etc.--display functions & descriptions, but not the General