text: Title: [DOC] Add info: how to sync forks
  Body: # Brief Description of Fix
  
  Currently, the docs do not provide instructions on how to sync up pyjanitor forks. This should be added as it is difficult for newcomers to know how to keep things updated. 
  
  # Relevant Context
  
  - [This page should be edited](https://pyjanitor.readthedocs.io/contributing.html)