Delete dubbo in the docs.

(cherry picked from commit 3632ecdf69)

README-zh.md

@@ -39,8 +39,6 @@ Spring Cloud Alibaba 致力于提供微服务开发的一站式解决方案。
 
 **[RocketMQ](https://rocketmq.apache.org/)**：一款开源的分布式消息系统，基于高可用分布式集群技术，提供低延时的、高可靠的消息发布与订阅服务。
 
-**[Dubbo](https://github.com/apache/dubbo)**：Apache Dubbo™ 是一款高性能 Java RPC 框架。
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 **[Seata](https://github.com/seata/seata)**：阿里巴巴开源产品，一个易于使用的高性能微服务分布式事务解决方案。
 
 **[Alibaba Cloud OSS](https://www.aliyun.com/product/oss)**: 阿里云对象存储服务（Object Storage Service，简称 OSS），是阿里云提供的海量、安全、低成本、高可靠的云存储服务。您可以在任何应用、任何时间、任何地点存储和访问任意类型的数据。

README.md

@@ -38,8 +38,6 @@ In addition to the above-mentioned features, for the needs of enterprise users'
 
 **[RocketMQ](https://rocketmq.apache.org/)**: A distributed messaging and streaming platform with low latency, high performance and reliability, trillion-level capacity and flexible scalability.
 
-**[Dubbo](https://github.com/apache/dubbo)**: A high-performance, Java based open source RPC framework.
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 **[Seata](https://github.com/seata/seata)**: A distributed transaction solution with high performance and ease of use for microservices architecture.
 
 **[Alibaba Cloud OSS](https://www.aliyun.com/product/oss)**: An encrypted and secure cloud storage service which stores, processes and accesses massive amounts of data from anywhere in the world.