📝 Document boolean icons in admin

[sergei-maertens]

Part of #4908

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.66%. Comparing base (7f8fd3b) to head (8efb9e5).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4986   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files         761      761           
  Lines       25957    25957           
  Branches     3393     3393           
=======================================
  Hits        25092    25092           
  Misses        601      601           
  Partials      264      264           

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[viktorvanwijk]

Thanks :)