Changes to Get a specific form

added the non-success response with the status 429

added the optional property lists/items/subscriber_description to the response with the 200 status

added the optional property lists/items/public_description to the response with the 200 status

added the optional property lists/items/subscribed_contacts_count to the response with the 200 status

added the optional property lists/items/unsubscribed_contacts_count to the response with the 200 status

added the media type application/json for the response with the status 403

added the optional property gdpr_required to the response with the 200 status

added the optional property redirect_url to the response with the 200 status

added the optional property url to the response with the 200 status

the response property title became required for the status 200

added the required property lists to the response with the 200 status