adding clarifying limitations of CSV file format

[abostroem]

Closes #198

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🔍 Inspect the changes: https://github.com/datacarpentry/astronomy-python/compare/md-outputs..md-outputs-PR-214

The following changes were observed in the rendered markdown documents:

 06-join.md | 4 ++++
 md5sum.txt | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

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⏱️ Updated at 2023-12-30 01:29:55 +0000