AdoptAWidget: SliverWithKeepAliveWidget (#69470) (#69557)

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

@@ -746,6 +746,15 @@ class SliverChildListDelegate extends SliverChildDelegate {
 }
 
 /// A base class for sliver that have [KeepAlive] children.
+///
+/// See also:
+///
+/// * [KeepAlive], which marks whether its chlild widget should be kept alive.
+/// * [SliverChildBuilderDelegate] and [SliverChildListDelegate], slivers
+///    which make usr of the keep alive functionality through the
+///    `addAutomaticKeepAlives` property.
+/// * [SliverGrid] and [SliverList], two sliver widgets that are commonly
+///    wrapped with [KeepAlive] widgets to preserve their sliver child subtrees.
 abstract class SliverWithKeepAliveWidget extends RenderObjectWidget {
   /// Initializes fields for subclasses.
   const SliverWithKeepAliveWidget({