improves docs #176

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7 errors and 3 warnings

--- re-building ‘tmap_sneak_peek.Rmd’ using rmarkdown

processing vignette 'tmap_sneak_peek.Rmd' failed with diagnostics:

processing vignette 'tmap_vv.Rmd' failed with diagnostics:

Vignette re-building failed.

Build process failed

Process completed with exit code 1.

No such keg: /opt/homebrew/Cellar/r

No files were found with the provided path: /Users/runner/work/tmap/tmap/check. No artifacts will be uploaded.

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!