Clarify how the zoom_factor argument works

crates/egui/src/widgets/plot/mod.rs

@@ -1083,13 +1083,19 @@ impl PlotUi {
 
     /// Scale the plot bounds around a position in screen coordinates. Can be useful for
     /// implementing alternative plot navigation methods.
+    /// The plot bounds are divided by `zoom_factor`, therefore:
+    /// `zoom_factor > 1.0` zooms in, i.e., reduces the visible range to show more detail.
+    /// `zoom_factor < 1.0` zooms out, i.e., increases the visible range to show more data.
     pub fn zoom_bounds(&mut self, zoom_factor: Vec2, center: Pos2) {
         self.last_screen_transform.zoom(zoom_factor, center);
         self.bounds_modified = true.into();
     }
 
     /// Scale the plot bounds around the hovered position, if any. Can be useful for implementing
     /// alternative plot navigation methods.
+    /// The plot bounds are divided by `zoom_factor`, therefore:
+    /// `zoom_factor > 1.0` zooms in, i.e., reduces the visible range to show more detail.
+    /// `zoom_factor < 1.0` zooms out, i.e., increases the visible range to show more data.
     pub fn zoom_bounds_around_hovered(&mut self, zoom_factor: Vec2) {
         if let Some(hover_pos) = self.response.hover_pos() {
             self.zoom_bounds(zoom_factor, hover_pos);