WIP: Make Sphinx's doctest builder work
This MR tries to fix all errors in the code examples in the docs. Just do "make doctest" in the doc folder and see what happens.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This MR tries to fix all errors in the code examples in the docs. Just do "make doctest" in the doc folder and see what happens.