Update RocketMQ-Questions.md

docs/system-design/data-communication/RocketMQ-Questions.md

+本文来自读者 [PR](https://github.com/Snailclimb/JavaGuide/pull/291)。
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 - [1 单机版消息中心](#1-%E5%8D%95%E6%9C%BA%E7%89%88%E6%B6%88%E6%81%AF%E4%B8%AD%E5%BF%83)
@@ -205,4 +206,4 @@ class Broker {
 5. 滴滴出行基于RocketMQ构建企业级消息队列服务的实践：https://yq.aliyun.com/articles/664608
 6. 基于《RocketMQ技术内幕》源码注释：https://github.com/LiWenGu/awesome-rocketmq
 
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+[1]: https://leran2deeplearnjavawebtech.oss-cn-beijing.aliyuncs.com/somephoto/RocketMQ%E6%B5%81%E7%A8%8B.png