code: public function getEnd()
      {
          $reachedContent = false;
  
          foreach ($this->doc->getLines() as $index => $line) {
              // we went past a description, then hit a tag or blank line, so
              // the last line of the description must be the one before this one
              if ($reachedContent && ($line->containsATag() || !$line->containsUsefulContent())) {
                  return $index - 1;
              }
  
              // no short description was found
              if ($line->containsATag()) {
                  return null;
              }
  
              // we've reached content, but need to check the next lines too
              // in case the short description is multi-line
              if ($line->containsUsefulContent()) {
                  $reachedContent = true;
              }
          }
      }
docs: Get the line index of the line containing the end of the short
  description, if present.
  
  @return null|int