Improve Code Documentation

[oubiwann]

Tasks:

• [ ] Add docstrings to all example functions - #61
• [ ] Make other functions in workflow namespace public - #62
  • not only will this make them accessible to enterprising users,
  • it will also cause the docstrings for those functions to show up in Codox
• [ ] Document friend-oauth2.workflow/workflow better - #63
• [ ] Provide docstrings for all existing namespaces (not just the functions in the namespaces) - #65
• [ ] Ensure new namespaces for service helper functions have docstrings - #66

Part of release #64