[STY] fix doc strings flake8 errors that were ignored until now

[Remi-Gau]

• Closes none

Changes proposed in this pull request:

• removes errors to ignore from the flake8 config
• fix errors

[github-actions]

👋 @Remi-Gau Thanks for creating a PR!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (abb80ff) 91.85% compared to head (f9837dd) 92.06%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4264      +/-   ##
==========================================
+ Coverage   91.85%   92.06%   +0.20%     
==========================================
  Files         144      144              
  Lines       16419    16423       +4     
  Branches     3434     3435       +1     
==========================================
+ Hits        15082    15120      +38     
+ Misses        792      761      -31     
+ Partials      545      542       -3     

Flag	Coverage Δ
macos-latest_3.10_test_plotting	91.85% <100.00%> (?)
macos-latest_3.11_test_plotting	91.85% <100.00%> (+<0.01%)	⬆️
macos-latest_3.12_test_plotting	91.85% <100.00%> (?)
macos-latest_3.8_test_plotting	91.81% <100.00%> (?)
macos-latest_3.9_test_plotting	91.82% <100.00%> (?)
ubuntu-latest_3.10_test_plotting	91.85% <100.00%> (+<0.01%)	⬆️
ubuntu-latest_3.11_test_plotting	91.85% <100.00%> (?)
ubuntu-latest_3.12_test_plotting	91.85% <100.00%> (?)
ubuntu-latest_3.12_test_pre	91.85% <100.00%> (?)
ubuntu-latest_3.8_test_min	68.95% <100.00%> (?)
ubuntu-latest_3.8_test_plot_min	91.56% <100.00%> (?)
ubuntu-latest_3.8_test_plotting	91.81% <100.00%> (?)
ubuntu-latest_3.9_test_plotting	91.82% <100.00%> (?)
windows-latest_3.10_test_plotting	91.83% <100.00%> (?)
windows-latest_3.11_test_plotting	91.83% <100.00%> (?)
windows-latest_3.12_test_plotting	91.83% <100.00%> (?)
windows-latest_3.8_test_plotting	91.79% <100.00%> (?)
windows-latest_3.9_test_plotting	91.80% <100.00%> (?)

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[bthirion]

LGTM, thx !