Example 7.29: Prefix for :next missing

Example 7.29 on page 488 misses the prefix `o:` for `:next` in line 10
```
v:NobelPrizePhysicsShape a sh:NodeShape ;
  sh:targetClass o:NobelPrizePhysics ;
  sh:disjoint o:next ;
  sh:disjoint o:prev ;
  sh:property [
    sh:path ( o:next o:prev o:next ) ;
    sh:equals o:next
  ] ;
  sh:property [
    sh:path [ sh:zeroOrMorePath :next ] ;
    sh:disjoint o:prev
  ] .
```