chore: Document how actor tasks are terminated

[BulkBeing]

resolves #2151

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.72%. Comparing base (b268639) to head (7939549).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2155      +/-   ##
==========================================
- Coverage   63.74%   63.72%   -0.03%     
==========================================
  Files         322      322              
  Lines       31704    31697       -7     
==========================================
- Hits        20211    20199      -12     
- Misses      10440    10445       +5     
  Partials     1053     1053              

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