Update all hints and notes in text with hint and note admonitions

[HumphreyYang]

This issue is set up to maintain the consistency of style across the lecture series.

[mmcky]

@HumphreyYang would you be able to review lecture-python and lecture-python-advanced as well?

[HumphreyYang]

@HumphreyYang would you be able to review lecture-python and lecture-python-advanced as well?

Sure, I will create an issue in the corresponding repo.