`Content$update()` should use the response of the `PATCH` to replace the `Content` object's local data.

[toph-allen]

The Content$update() method of the Content class updates content on the server but does not update the local copy of the data, requiring another call to do so or simply working with an out-of-sync piece of content.

Any code calling Content$update() internally should be audited — if it calls Content$get_content_remote() after that call can be removed.