Fix iterator increment

[CodyCBakerPhD]

Motivation

Should fix https://github.com/NeurodataWithoutBorders/nwb-guide/issues/844

How to test the behavior?

Show how to reproduce the new behavior (can be a bug fix or a new feature)

Checklist

• [x] Did you update CHANGELOG.md with your changes?
• [X] Does the PR clearly describe the problem and the solution?
• [X] Have you reviewed our Contributing Guide?
• [X] Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?

[codecov[bot]]

Codecov Report

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

Project coverage is 88.79%. Comparing base (ece2c27) to head (ad4fd7e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1128 +/- ## ======================================= Coverage 88.79% 88.79% ======================================= Files 45 45 Lines 9774 9774 Branches 2776 2776 ======================================= Hits 8679 8679 Misses 778 778 Partials 317 317 ```

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[rly]

Thanks for digging into this and addressing it, @CodyCBakerPhD !