chore(config): update keepachangelog.toml comment

[artrz]

Fix typo on header comment

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other: fix a template comment

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.66%. Comparing base (9dbf47b) to head (6efa632).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #779      +/-   ##
==========================================
- Coverage   36.73%   36.66%   -0.06%     
==========================================
  Files          20       20              
  Lines        1544     1544              
==========================================
- Hits          567      566       -1     
- Misses        977      978       +1     

Flag	Coverage Δ
unit-tests	36.66% <ø> (-0.06%)	⬇️

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