message: Update design-principles.md
  Correct variable in construct permission example
diff: @@ -98,7 +98,7 @@ cron.attachPermissions(["s3", table]);
  Or grant a specific permission for a construct.
  ```js {4-7}
  -const sns = new sns.Topic(this, "Topic");
  +const topic = new sns.Topic(this, "Topic");
  const table = new Table(this, "Table");
  cron.attachPermissions([
  