BE-3892 Improve Swagger for V2 API cancel action

- source :: https://hungryroot.atlassian.net/browse/BE-3892

- tags :: Hungryroot API Project

- epic :: EP-592 Kill Django Templates

- sprint :: HR BE Sprint 104

- status :: Status - To Do

Description

Followup for https://hungryroot.atlassian.net/browse/BE-3431

I’m going to accept this but make a followup to improve the Swagger docs around the request payload and the example. For example what are the cancel reasons and cancel sub reasons. At first I pass I got and error 0 is invalid for AutoField.