Fixing a small typo

[AntoineRondelet]

As per the title - I was reading the book and saw this small typo, so here's a PR to fix it :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.88%. Comparing base (5f4ac6e) to head (d3f7430).
Report is 99 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #863      +/-   ##
==========================================
+ Coverage   82.18%   82.88%   +0.69%     
==========================================
  Files          31       41      +10     
  Lines        3188     4387    +1199     
==========================================
+ Hits         2620     3636    +1016     
- Misses        568      751     +183     

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