code: private function makeDocBlockMultiLineIfNeeded(DocBlock $doc, Tokens $tokens, $docBlockIndex)
      {
          $lines = $doc->getLines();
          if (1 === \count($lines) && empty($doc->getAnnotationsOfType('internal'))) {
              $lines = $this->splitUpDocBlock($lines, $tokens, $docBlockIndex);
  
              return new DocBlock(implode('', $lines));
          }
  
          return $doc;
      }
docs: @param DocBlock $doc
  @param Tokens   $tokens
  @param int      $docBlockIndex
  
  @return DocBlock