more docstrings

[mr-c]

• remove unused code
• Improve the docs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.14%. Comparing base (2291376) to head (af5026a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2158      +/-   ##
==========================================
+ Coverage   84.59%   85.14%   +0.54%     
==========================================
  Files          46       46              
  Lines        8389     8328      -61     
  Branches     1970     1953      -17     
==========================================
- Hits         7097     7091       -6     
+ Misses        824      769      -55     
  Partials      468      468              

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