docs(readme): Update exception notify test commands

- Modify exception notify test commands for better clarity
- Add channel and config options for mail testing
- Retain original sync and verbosity options for consistency

Author: guanguans

README.md

@@ -56,10 +56,11 @@ EXCEPTION_NOTIFY_WEWORK_TOKEN=73a3d5a3-ceff-4da8-bcf3-ff5891778
 ### Testing for exception notify
 
 ```shell
-php artisan exception-notify:test --channel=dump --queue-connection=sync --ansi -v
-php artisan exception-notify:test --queue-connection=sync --ansi -v
-php artisan exception-notify:test --ansi -v
-php artisan exception-notify:test --ansi
+php artisan exception-notify:test --channel=dump --queue-connection=sync
+php artisan exception-notify:test --channel=mail --config=mail.default=log --queue-connection=sync
+php artisan exception-notify:test --queue-connection=sync
+php artisan exception-notify:test
+php artisan exception-notify:test -v
 ```
 
 ### :camera_flash: Notification examples