fix calculation of γ and remove a false comment in the Wikipedia tutorial

[slayoo]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.85%. Comparing base (d1c9c73) to head (dd02043).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1812   +/-   ##
=======================================
  Coverage   86.85%   86.85%           
=======================================
  Files         415      415           
  Lines       10558    10558           
=======================================
  Hits         9170     9170           
  Misses       1388     1388           

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[slayoo]

well, it's tricky to test this one as the settings from the Golovin test case used in Shima et al. paper do not actually depend on the path which is being fixed here... let's just merge