docs(applicationautoscaling): correct default for scaleInCooldown and…

… scaleOutCooldown (#6417)

See https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-applicationautoscaling-scalingpolicy-targettrackingscalingpolicyconfiguration.html#cfn-applicationautoscaling-scalingpolicy-targettrackingscalingpolicyconfiguration-scaleincooldown

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

packages/@aws-cdk/aws-applicationautoscaling/lib/target-tracking-scaling-policy.ts

@@ -35,14 +35,24 @@ export interface BaseTargetTrackingProps {
   /**
    * Period after a scale in activity completes before another scale in activity can start.
    *
-   * @default - No scale in cooldown.
+   * @default Duration.seconds(300) for the following scalable targets: ECS services,
+   * Spot Fleet requests, EMR clusters, AppStream 2.0 fleets, Aurora DB clusters,
+   * Amazon SageMaker endpoint variants, Custom resources. For all other scalable
+   * targets, the default value is Duration.seconds(0): DynamoDB tables, DynamoDB
+   * global secondary indexes, Amazon Comprehend document classification endpoints,
+   * Lambda provisioned concurrency
    */
   readonly scaleInCooldown?: cdk.Duration;
 
   /**
    * Period after a scale out activity completes before another scale out activity can start.
    *
-   * @default - No scale out cooldown.
+   * @default Duration.seconds(300) for the following scalable targets: ECS services,
+   * Spot Fleet requests, EMR clusters, AppStream 2.0 fleets, Aurora DB clusters,
+   * Amazon SageMaker endpoint variants, Custom resources. For all other scalable
+   * targets, the default value is Duration.seconds(0): DynamoDB tables, DynamoDB
+   * global secondary indexes, Amazon Comprehend document classification endpoints,
+   * Lambda provisioned concurrency
    */
   readonly scaleOutCooldown?: cdk.Duration;
 }