removing final reference to factors

[jonjab]

a couple of oblique references to factors remained. I think I have eliminated them all now.

[github-actions]

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 07-vector-shapefile-attributes-in-r.md | 8 ++++----
 md5sum.txt                             | 2 +-
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⏱️ Updated at 2025-01-21 22:57:10 +0000