Pass response schema descriptions through the Markdown parser

[erunion]

Response schema descriptions that contain Markdown are not having that Markdown parsed, resulting in improperly formatted content such as the following:

"responses": {
  "403": {
    "description": "No access_token was provided with this request. \n \n The access_token provided is not permitted to access the specified resource. \r \r Person not found",
    "content": {
      "application/json": {
        "schema": {
          "$ref": "#/components/schemas/RestException"
        }
      }
    }
  },

And parsed as Markdown: