correct plotting a joined data frame exercise

[goi42]

Updated the language to be more precise and corrected some references to non-existent/mis-named files and columns.

[github-actions]

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🔍 Inspect the changes: https://github.com/datacarpentry/python-ecology-lesson/compare/md-outputs..md-outputs-PR-626

The following changes were observed in the rendered markdown documents:

 05-merging-data.md | 16 ++++++++--------
 md5sum.txt         |  2 +-
 2 files changed, 9 insertions(+), 9 deletions(-)

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⏱️ Updated at 2025-06-27 15:21:19 +0000