Fix typo.
Add learning goal re: use of docstrings for functions.
Buff `python-3-conditionals-defensive` notebook for UBC-EOAS bootcamp.
Reorder assertions section & add try/except block content.
Make function docstrings content more prominent.
Buff the string formating section.
Remove the last completed TODO.
Add Jessica and Caroline as helpers.
Move planning notes to lesson index pages.

Add details of EOAS Dep Colloquim on 26-Sep.