OverlayState.add* should have been OverlayState.insert* (#9773)
Trivial doc typo.
diff --git a/packages/flutter/lib/src/widgets/overlay.dart b/packages/flutter/lib/src/widgets/overlay.dart
index f34b821..5d4ac10 100644
--- a/packages/flutter/lib/src/widgets/overlay.dart
+++ b/packages/flutter/lib/src/widgets/overlay.dart
@@ -215,8 +215,8 @@
/// To add entries to an [Overlay] that is already in the tree, use
/// [Overlay.of] to obtain the [OverlayState] (or assign a [GlobalKey] to the
/// [Overlay] widget and obtain the [OverlayState] via
- /// [GlobalKey.currentState]), and then use [OverlayState.add] or
- /// [OverlayState.addAll].
+ /// [GlobalKey.currentState]), and then use [OverlayState.insert] or
+ /// [OverlayState.insertAll].
///
/// To remove an entry from an [Overlay], use [OverlayEntry.remove].
final List<OverlayEntry> initialEntries;
