adjust prompts in time management exercise

[tobyhodges]

Closes #406 by adjusting the prompts in the Time Management exercise. See discussion in the issue for more context.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries/lesson-development-training/compare/md-outputs..md-outputs-PR-538

The following changes were observed in the rendered markdown documents:

 explanation.md | 14 +++++++-------
 md5sum.txt     |  2 +-
 2 files changed, 8 insertions(+), 8 deletions(-)

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⏱️ Updated at 2025-11-24 19:40:00 +0000

[sstevens2]

Looks good to me!