Fix link to best practices for calendar-safe code

[lionel-bijaoui]

No description provided.

[ptomato]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.83%. Comparing base (e2da8c7) to head (ed1db1c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3300   +/-   ##
=======================================
  Coverage   97.83%   97.83%           
=======================================
  Files          22       22           
  Lines       10725    10725           
  Branches     1856     1856           
=======================================
  Hits        10493    10493           
  Misses        215      215           
  Partials       17       17           

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