Minor doc fix for`CupertinoTabBar` (#91829)

packages/flutter/lib/src/cupertino/bottom_tab_bar.dart

@@ -45,7 +45,7 @@ const Color _kDefaultTabBarInactiveColor = CupertinoColors.inactiveGray;
 /// [MediaQuery.textScaleFactorOf] against [CupertinoApp]'s [BuildContext].
 ///
 /// {@tool dartpad}
-/// This example shows a [CupertinoTabBar] placed in a [CupertinoPageScaffold].
+/// This example shows a [CupertinoTabBar] placed in a [CupertinoTabScaffold].
 ///
 /// ** See code in examples/api/lib/cupertino/bottom_tab_bar/bottom_tab_bar.0.dart **
 /// {@end-tool}