code: private function setExplanation(PropertyInterface $property, $propInfo)
      {
          if ($property->getExplanation() || !isset($propInfo['explanation'])) {
              return;
          }
  
          $property->setExplanation($propInfo['explanation']);
      }
docs: Set the explanation in the property.
  
  @param PropertyInterface $property The property definition.
  @param array             $propInfo The property info array.
  
  @return void