adding callout about aes global and local mappings

[jt14den]

closes #74 in https://librarycarpentry.github.io/lc-r/04-data-viz-ggplot.html and explains that aes() can happen in main ggplot() function or in geoms(). uses the callout component.

[github-actions]

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🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-r/compare/md-outputs..md-outputs-PR-113

The following changes were observed in the rendered markdown documents:

 04-data-viz-ggplot.md                              |  21 +++++++++++++++++++++
 ...t-rendered-boxplot-exercise-subcollection-1.png | Bin 46243 -> 46596 bytes
 ...a-viz-ggplot-rendered-boxplot-with-points-1.png | Bin 42280 -> 42361 bytes
 ...data-viz-ggplot-rendered-unnamed-chunk-14-1.png | Bin 37929 -> 38525 bytes
 fig/04-data-viz-ggplot-rendered-violin-plot-1.png  | Bin 37547 -> 37800 bytes
 md5sum.txt                                         |   2 +-
 6 files changed, 22 insertions(+), 1 deletion(-)

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⏱️ Updated at 2025-02-13 02:27:20 +0000