addressing review (apache#25255)

Author: darkhan.nausharipov

playground/frontend/playground_components/lib/src/widgets/dialogs/confirm.dart

@@ -36,8 +36,8 @@ class ConfirmDialog extends StatelessWidget {
   static Future<bool> show({
     required BuildContext context,
     required String title,
-    required String? subtitle,
     required String confirmButtonText,
+    String? subtitle,
   }) async {
     return await showDialog(
       context: context,

playground/frontend/playground_components/lib/src/widgets/overlay/overlays.dart

@@ -22,7 +22,8 @@ import '../../../playground_components.dart';
 
 /// Groups common overlays.
 class BeamOverlays {
-  /// Shows an overlay until future completes.
+  /// Shows an overlay with [CircularProgressIndicator]
+  /// until [future] completes.
   static Future<void> showProgressOverlay(
     BuildContext context,
     Future future,