Update README.md

Author: Snailclimb

README.md

@@ -185,7 +185,7 @@
 - [数据通信(RESTful、RPC、消息队列)相关知识点总结](docs/system-design/data-communication/summary.md)
 - [Dubbo 总结：关于 Dubbo 的重要知识点](docs/system-design/data-communication/dubbo.md)
 - [消息队列总结](docs/system-design/data-communication/message-queue.md)
-- [RabbitMQ 入门](docs/system-design/data-communication/RabbitMQ.md)
+- [RabbitMQ 入门](docs/system-design/data-communication/rabbitmq.md)
 - [RocketMQ的几个简单问题与答案](docs/system-design/data-communication/RocketMQ-Questions.md)
 
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