Update CHANGELOG.md for #19594

CHANGELOG.md

@@ -39,6 +39,7 @@ BUG FIXES:
 * resource/aws_apprunner_service: Suppress `instance_configuration` `cpu` and `memory` differences ([#19483](https://github.com/hashicorp/terraform-provider-aws/issues/19483))
 * resource/aws_batch_job_definition: Don't crash when setting `timeout.attempt_duration_seconds` to `null` ([#19505](https://github.com/hashicorp/terraform-provider-aws/issues/19505))
 * resource/aws_cloudformation_stack: Avoid conflicts with `on_failure` and `disable_rollback` ([#10539](https://github.com/hashicorp/terraform-provider-aws/issues/10539))
+* resource/aws_cloudwatch_event_api_destination: Reduce the maximum allowed value for the `invocation_rate_limit_per_second` argument to `300` ([#19594](https://github.com/hashicorp/terraform-provider-aws/issues/19594))
 * resource/aws_ec2_managed_prefix_list: Fix crash with multiple description-only updates ([#19517](https://github.com/hashicorp/terraform-provider-aws/issues/19517))
 * resource/aws_eks_addon: Use `service_account_role_arn`, if set, on updates ([#19454](https://github.com/hashicorp/terraform-provider-aws/issues/19454))
 * resource/aws_glue_connection: `connection_properties` are optional ([#19375](https://github.com/hashicorp/terraform-provider-aws/issues/19375))