Added a clarification on scrollBehaviour in BoxScroll and ListView (#107738)

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

@@ -620,6 +620,14 @@ class CustomScrollView extends ScrollView {
 
 /// A [ScrollView] that uses a single child layout model.
 ///
+/// {@template flutter.widgets.BoxScroll.scrollBehaviour}
+/// [ScrollView]s are often decorated with [Scrollbar]s and overscroll indicators,
+/// which are managed by the inherited [ScrollBehavior]. Placing a
+/// [ScrollConfiguration] above a ScrollView can modify these behaviors for that
+/// ScrollView, or can be managed app-wide by providing a ScrollBehavior to
+/// [MaterialApp.scrollBehavior] or [CupertinoApp.scrollBehavior].
+/// {@endtemplate}
+///
 /// See also:
 ///
 ///  * [ListView], which is a [BoxScrollView] that uses a linear layout model.
@@ -1012,6 +1020,8 @@ abstract class BoxScrollView extends ScrollView {
 /// ** See code in examples/api/lib/widgets/scroll_view/listview_select.1.dart **
 /// {@end-tool}
 ///
+/// {@macro flutter.widgets.BoxScroll.scrollBehaviour}
+///
 /// See also:
 ///
 ///  * [SingleChildScrollView], which is a scrollable widget that has a single