Add explanation for use of sf package

[mneilson-usgs]

Add link to the Wikipedia entry for Simple Features, and statement about other software that implement the Simple Features Access standard, to provide context for students on why the sf package is used for vector data in these lessons

Closes #446

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/r-raster-vector-geospatial/compare/md-outputs..md-outputs-PR-492

The following changes were observed in the rendered markdown documents:

 06-vector-open-shapefile-in-r.md | 11 +++++++----
 md5sum.txt                       |  2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)

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⏱️ Updated at 2025-08-13 15:26:09 +0000