Mention caution divs & include keywords for callout+spoiler fenced divs

[tobyhodges]

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

Resolves #457 by making clearer what keywords should be used for the callout, spoiler, and caution fenced divs.

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries/lesson-development-training/compare/md-outputs..md-outputs-PR-458

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 lesson-content.md | 22 +++++++++-------------
 md5sum.txt        |  2 +-
 2 files changed, 10 insertions(+), 14 deletions(-)

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⏱️ Updated at 2024-12-03 08:52:16 +0000

[tobyhodges]

This will also partially address #442, by mentioning the caution class of fenced div