Update future.dart

Closes #61498

GitOrigin-RevId: 21aa584
Change-Id: If1d3f6eefd2619eb7a9e13b00ff041011924c4b6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449371
Commit-Queue: Slava Egorov <[email protected]>
Reviewed-by: Slava Egorov <[email protected]>

Author: kBrahman

sdk/lib/async/future.dart

@@ -1012,7 +1012,7 @@ extension FutureExtensions<T> on Future<T> {
   /// If [test] is supplied, only catches errors of type [E]
   /// where [test] returns `true`.
   /// If [E] is [Object], then all errors are potentially caught,
-  /// depending only on a supplied [test].toString()
+  /// depending only on a supplied [test].
   ///
   /// If the error is caught,
   /// the returned future completes with the result of calling [handleError]