Fix italics formatting in package structure section

[kellychang4]

Correcting a missing closing italics asterisk as requested in #586 (comment).

[github-actions]

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🔍 Inspect the changes: https://github.com/swcarpentry/r-novice-inflammation/compare/md-outputs..md-outputs-PR-587

The following changes were observed in the rendered markdown documents:

 08-making-packages-R.md | 2 +-
 md5sum.txt              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2023-08-02 12:57:32 +0000

[Bisaloo]

Thanks!