code: private function getDescription($node)
      {
          if ($node->description) {
              return $node->description->value;
          }
          if (isset($this->options['commentDescriptions'])) {
              $rawValue = $this->getLeadingCommentBlock($node);
              if ($rawValue !== null) {
                  return BlockString::value("\n" . $rawValue);
              }
          }
  
          return null;
      }
docs: Given an ast node, returns its string description.