document that Files API only supports Diego deployed apps

[dkoper]

Files API (http://apidocs.cloudfoundry.org/226/files/retrieve_file.html) does not document that it does not work for DIEGO deployed apps, and what API endpoint to use as alternative.

When called with the guid of an app deployed to DIEGO, this API returns:

{
  "code": 190001,
  "description": "File error: Request failed for app: cf-cli-ref-guide, instance: 0 and path:  as the instance is not found.",
  "error_code": "CF-FileError"
}

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this. You can view the current status of your issue at: https://www.pivotaltracker.com/story/show/111045266.

[simonleung8]

Dies, thanks for reporting this, we have documented that Files API is for non-Diego app only.

Docs will be updated once changes flow through our pipeline.

Thanks