docs: Fix spelling in the contributing guide

[glemaitre]

Summary

Fixing a typo in the contributing guideline.

Checklist

• I understand and agree to the Code of Conduct.
• I have followed the Style Guide for Python Code as best as possible for the submitted code.
• I have added pytest unit tests for any new functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.91%. Comparing base (336e688) to head (2a51daa).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #516   +/-   ##
=======================================
  Coverage   88.91%   88.91%           
=======================================
  Files          44       44           
  Lines        5212     5212           
=======================================
  Hits         4634     4634           
  Misses        578      578           

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[rich-iannone]

Thanks!

[machow]

Thanks!