adjust demo guidance for lc-data-intro-archives

[tobyhodges]

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

Closes #1970

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

Adjusts the guidance for the lc-data-intro-archives lesson to reflect that, even if it is marked stable, none of its episodes will be suitable for teaching demos.

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🔍 Inspect the changes: https://github.com/carpentries/instructor-training/compare/md-outputs..md-outputs-PR-1990

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 demo_lessons.md | 4 ++--
 md5sum.txt      | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

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⏱️ Updated at 2026-03-19 07:20:09 +0000