Blocksvar: p11 needs more user scaffolding

Moved from GitHub tutorial/31

Posted by kortschak:

The task on p11 attempts to get the tutorial user to do too much at once. I can see what you are trying for, but there could be an intermediate “show answer” which does a walk over the graph getting some of the data as a simple query, e.g.:

{
  q(func: has(director.film)) @cascade {
    name@en
    max(val(date))
    director.film(orderdesc: initial_release_date) {
      name@en
      date as initial_release_date
    }
  }
}

This partially decouples the walk from the variable use for the main query, which is what is being taught on this page.