Fix incorrect parameter name in Questionnaire doc

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Codecov Report

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

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## rel_7_6 #6400 +/- ## ========================================== Coverage ? 83.51% Complexity ? 27762 ========================================== Files ? 1738 Lines ? 107447 Branches ? 13489 ========================================== Hits ? 89737 Misses ? 11920 Partials ? 5790 ```

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