Changes to Retrieve a Form

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 429

added the non-success response with the status 500

the security scope read_forms was added to the endpoint's security scheme oauth2

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