• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: xxx
• Operating System version: xxx
• Java version: xxx

Steps to reproduce this issue

1. 文档中描述protocol级别支持token, 实际上不支持，请更新文档描述：
   http://dubbo.apache.org/zh-cn/docs/user/demos/token-authorization.html

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!