code: public function linkedin($summary = '')
      {
          $base = config('laravel-share.services.linkedin.uri');
          $mini = config('laravel-share.services.linkedin.extra.mini');
          $url = $base . '?mini=' . $mini . '&url=' . $this->url . '&title=' . urlencode($this->title) . '&summary=' . urlencode($summary);
  
          $this->buildLink('linkedin', $url);
  
          return $this;
      }
docs: Linked in share link
  
  @param string $summary
  @return $this