docs: clarify commit message requirements in `contribution.md`

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.52%. Comparing base (7fc8567) to head (b9e1c83).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1416 +/- ## ======================================= Coverage 69.52% 69.52% ======================================= Files 186 186 Lines 18326 18326 ======================================= Hits 12742 12742 Misses 4909 4909 Partials 675 675 ```

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