docs: some more docs about ugprade

[tmigone]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.16%. Comparing base (bc84c86) to head (b7e0a95).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1354    +/-   ##
========================================
  Coverage   91.16%   91.16%            
========================================
  Files          81       81            
  Lines        5319     5319            
  Branches      969     1128   +159     
========================================
  Hits         4849     4849            
  Misses        448      448            
  Partials       22       22            

Flag	Coverage Δ
unittests	91.16% <ø> (ø)

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