Fix typo in doctest configuration

[codecov[bot]]

Codecov Report

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

Project coverage is 98.92%. Comparing base (fdd2051) to head (d9d0e29). Report is 13 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #371 +/- ## ======================================= Coverage 98.92% 98.92% ======================================= Files 37 37 Lines 4196 4196 ======================================= Hits 4151 4151 Misses 45 45 ```

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