message: Add docs for snsSubscriptions property for Topic construct
diff: @@ -192,6 +192,12 @@ _Type_ : [`cdk.aws-sns.Topic`](https://docs.aws.amazon.com/cdk/api/latest/docs/@
  The internally created CDK `Topic` instance.
  +### snsSubscriptions
  +
  +_Type_ : [`cdk.aws-sns.Subscription`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-sns.Subscription.html)
  +
  +A list of the internally created CDK `Subscription` instances.
  +
  ### subscriberFunctions
  _Type_ : `Function[]`
  