Update keyboard shortcuts for cell operations

[nap84]

Adds more (or more precise) keyboard shortcuts and fixes a typo in the lists examples

[github-actions]

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🔍 Inspect the changes: https://github.com/dkz2r/python-novice-gapminder/compare/md-outputs..md-outputs-PR-11

The following changes were observed in the rendered markdown documents:

 01-run-quit.md | 6 ++++--
 md5sum.txt     | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

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⏱️ Updated at 2026-05-22 13:13:47 +0000