Clean up yaml blocks in several files

[willingc]

• [x] https://github.com/pyOpenSci/lessons/blob/main/clean-modular-code/checks-conditionals/python-functions-multi-parameters.md
• [x] https://github.com/pyOpenSci/lessons/blob/main/clean-modular-code/checks-conditionals/write-python-functions.md

[willingc]

These were fixed in the flurry of activity today.