documentation uopdate

[milyin]

• liveliness history parameter described
• selector doc improved

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.24%. Comparing base (1bd82ee) to head (5973e3b).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2227      +/-   ##
==========================================
+ Coverage   71.12%   71.24%   +0.12%     
==========================================
  Files         375      375              
  Lines       61020    61020              
==========================================
+ Hits        43400    43476      +76     
+ Misses      17620    17544      -76     

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