Fixed wording in AnimationSet.Completed XML docs

Author: Sergio0694

Microsoft.Toolkit.Uwp.UI.Animations/Xaml/AnimationSet.cs

@@ -32,7 +32,7 @@ public sealed class AnimationSet : DependencyObjectCollection
         public event EventHandler? Started;
 
         /// <summary>
-        /// Raised whenever the current animation ends.
+        /// Raised whenever the current animation completes.
         /// </summary>
         public event EventHandler? Completed;