[Update]: Removal of publish 'copyable' field from API response

We recently added functionality that allows makers to disable copying of their docs in a secure manner.

As a result, we’ll be removing the copyable field returned in the optional published details of the response body for the GET /docs/{docId} and GET /docs endpoints.

This field is now superseded by the doc’s top-level copyability settings, making the current API field inaccurate in some cases. We will therefore drop this field from response bodies, starting later this week.