docs: Fix typo in parameter name 'diffference_function'

[oameye]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.65%. Comparing base (928bdb0) to head (6a989de).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
+ Coverage   54.86%   61.65%   +6.78%     
==========================================
  Files          22       26       +4     
  Lines         904     1051     +147     
==========================================
+ Hits          496      648     +152     
+ Misses        408      403       -5     

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[Datseris]

don't forge tto bump patch version in project.toml!