Adding reference definitions to Error response

[smmathur]

In the "Response Error Codes" section, how to refer the error definitions using $ref?
In the Swagger specs, there are JSON references $ref definitions, which we need to display in the "Response Error Codes" section along with the HTTP Code & description.

E.g.

Swagger:

"400": {
            "description": "BadRequest",
            "schema": {
              "$ref": "#/definitions/GeneralError"

The Response Error Codes should display the definition of the “GeneralError” details from the spec.