Update invalid pandas indexing statement

[phofl]

If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.

closes #579

Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.

The existing statement would raise

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/python-ecology-lesson/compare/md-outputs..md-outputs-PR-580

The following changes were observed in the rendered markdown documents:

 03-index-slice-subset.md | 2 +-
 md5sum.txt               | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2023-08-18 12:07:11 +0000