Add HTTP POST error response to documentation

[anetz89]

Following the current Python Eve documentation, there's an error http response status next to the success response (201)

When all documents pass validation and are inserted correctly the response status is 201 Created. If any document fails validation the response status is 422 UnprocessableEntity

Is it possible to add this error status to the documentation per default? Listing all possible error codes (like 404 or 401) may be too much, but 422 should show up in the documentation. Also mind the option to override this status code with the VALIDATION_ERROR_STATUS setting.

[stale[bot]]

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