Fix syntax with alt text

[martinosorb]

Fixes #999.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/swcarpentry/git-novice/compare/md-outputs..md-outputs-PR-1000

The following changes were observed in the rendered markdown documents:

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

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If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible.

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⏱️ Updated at 2024-07-03 12:19:21 +0000

[martinosorb]

Merging because this is a bug in the display of images and I think it's better to address it quickly.