Add troubleshooting note about logging in Laravel Tinker (#15242)

Author: stayallive

docs/platforms/php/guides/laravel/logs/index.mdx

@@ -31,6 +31,8 @@ With Sentry Structured Logs, you can send text-based log information from your L
 
 If your logs are not appearing in Sentry, check or test the following:
 
+If you are testing in Tinker (`php artisan tinker`), make sure to call `\Sentry\logger()->flush();` manually to send Logs to Sentry as it does not trigger automatically.
+
 Check your `config/logging.php` and ensure the default log channel and stack channel allow configuration using environment variables:
 
 ```php {filename:config/logging.php}