Fix duration logic in docs

[LaurensBurger]

Logic rules did not work

Closes #...

Changes

Fixes the logic rules regarding "duration" which did not work.

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [ ] Checked copying a form
  • [ ] Checked import/export of a form
  • [ ] Config checks in the configuration overview admin page
  • [ ] Problem detection in the admin email digest is handled

• Release management

  • [ ] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [ ] Ran ./bin/makemessages_js.sh
  • [ ] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [ ] Commit messages refer to the relevant Github issue
  • [ ] Commit messages explain the "why" of change, not the how

[codecov[bot]]

Codecov Report

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

Project coverage is 96.58%. Comparing base (e4fb7bb) to head (447e992). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4847 +/- ## ======================================= Coverage 96.58% 96.58% ======================================= Files 749 749 Lines 25531 25531 Branches 3376 3376 ======================================= Hits 24659 24659 Misses 608 608 Partials 264 264 ```

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