Add explanation for plt.show

[andrewgait]

Resolves #16

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/UoMResearchIT/programming_with_python/compare/md-outputs..md-outputs-PR-60

The following changes were observed in the rendered markdown documents:

 03-numpy_essential.md | 12 ++++++++++++
 md5sum.txt            |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

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⏱️ Updated at 2026-04-13 12:07:00 +0000

[Scottan]

LGTM