Zeppelin backend API broken or out of date with docs

https://zeppelin.apache.org/docs/0.7.0-SNAPSHOT/displaysystem/back-end-angular.html#lets-make-it-simpler-and-more-intuitive

The documentation there says:
import org.apache.zeppelin.display.angular.notebookscope._
import AngularElem._

However, this throws an error:
<console>:42: error: object angular is not a member of package org.apache.zeppelin.display