3 check-ins using file docs/weeks/4.md version a8bcf42c5a

2022-02-09
11:21
update schedule and instructor info check-in: 88c26d24cf user: jboy tags: revise-for-2022
11:21
update FAQ check-in: f5559300f4 user: jboy tags: revise-for-2022
10:41
update descriptions of weekly sessions check-in: 29d919ada3 user: jboy tags: revise-for-2022