fix date calculation

meeting/2021-12-06.md

@@ -131,8 +131,8 @@ Let's keep doing the triage rotation, which means the following weeks:
  * week 51 (dec 12-18): anarcat
  * week 52 (dec 19-25): kez
  * week 1 2022 (dec 26 - jan 1 2022): anarcat
- * week 2 (jan 2-7 2022): lavamind
- * week 3 (jan 8-14 2022): kez
+ * week 2 (jan 2-9 2022): lavamind
+ * week 3 (jan 10-17 2022): kez
 
 anarcat and lavamind swapped the two last weeks, normal schedule
 (anarcat/kez/lavamind) should resume after.