fix word in doc comment (#74927)

0e17b2de · Tyler Norbury · GitHub · 31732bc6 · 0e17b2de
Unverified Commit 0e17b2de authored Jan 29, 2021 by Tyler Norbury Committed by GitHub Jan 29, 2021
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animation_controller.dart packages/flutter/lib/src/animation/animation_controller.dart +1 -1

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--- a/packages/flutter/lib/src/animation/animation_controller.dart
+++ b/packages/flutter/lib/src/animation/animation_controller.dart
@@ -312,7 +312,7 @@ class AnimationController extends Animation<double>

  /// The length of time this animation should last when going in [reverse].
  ///
-  /// The value of [duration] us used if [reverseDuration] is not specified or
+  /// The value of [duration] is used if [reverseDuration] is not specified or
  /// set to null.
  Duration? reverseDuration;