Further clarify Stack documentation on overflowing (#130776)

Fixes #75731

packages/flutter/lib/src/widgets/basic.dart

@@ -3914,11 +3914,13 @@ class Stack extends MultiChildRenderObjectWidget {
 
   /// {@macro flutter.material.Material.clipBehavior}
   ///
-  /// Stacks only clip children whose geometry overflow the stack. A child that
-  /// paints outside its bounds (e.g. a box with a shadow) will not be clipped,
-  /// regardless of the value of this property. Similarly, a child that itself
-  /// has a descendant that overflows the stack will not be clipped, as only the
-  /// geometry of the stack's direct children are considered.
+  /// Stacks only clip children whose _geometry_ overflows the stack. A child
+  /// that paints outside its bounds (e.g. a box with a shadow) will not be
+  /// clipped, regardless of the value of this property. Similarly, a child that
+  /// itself has a descendant that overflows the stack will not be clipped, as
+  /// only the geometry of the stack's direct children are considered.
+  /// [Transform] is an example of a widget that can cause its children to paint
+  /// outside its geometry.
   ///
   /// To clip children whose geometry does not overflow the stack, consider
   /// using a [ClipRect] widget.