Fix wrong branch info

README-zh.md

@@ -27,7 +27,7 @@ Spring Cloud Alibaba 致力于提供微服务开发的一站式解决方案。
 * **阿里云短信服务**：覆盖全球的短信服务，友好、高效、智能的互联化通讯能力，帮助企业迅速搭建客户触达通道。
 
 
-更多功能请参考 [Roadmap](https://github.com/alibaba/spring-cloud-alibaba/blob/2022.x/Roadmap-zh.md)
+更多功能请参考 [Roadmap](https://github.com/alibaba/spring-cloud-alibaba/blob/2021.x/Roadmap-zh.md)
 
 除了上述所具有的功能外，针对企业级用户的场景，Spring Cloud Alibaba 配套的企业版微服务治理方案 [微服务引擎MSE](https://www.aliyun.com/product/aliware/mse?spm=github.spring.com.topbar) 还提供了企业级微服务治理中心，包括全链路灰度、服务预热、无损上下线和离群实例摘除等更多更强大的治理能力，同时还提供了企业级 Nacos 注册配置中心，企业级云原生网关等多种产品及解决方案。
 
@@ -52,7 +52,7 @@ Spring Cloud Alibaba 致力于提供微服务开发的一站式解决方案。
 更多组件请参考 [Roadmap](https://github.com/alibaba/spring-cloud-alibaba/blob/2022.0/Roadmap-zh.md)。
 
 ## 如何构建
-* 2022.x 分支对应的是 Spring Cloud 2022 与 Spring Boot 2.6.x，最低支持 JDK 1.8。
+* 2021.x 分支对应的是 Spring Cloud 2022 与 Spring Boot 2.6.x，最低支持 JDK 1.8。
 * 2020.0 分支对应的是 Spring Cloud 2020 与 Spring Boot 2.4.x，最低支持 JDK 1.8。
 * 2.2.x 分支对应的是 Spring Cloud Hoxton 与 Spring Boot 2.2.x，最低支持 JDK 1.8。
 * greenwich 分支对应的是 Spring Cloud Greenwich 与 Spring Boot 2.1.x，最低支持 JDK 1.8。
@@ -118,7 +118,7 @@ Example 列表：
 * 2.1.x 版本适用于 Spring Boot 2.1.x
 * 2.2.x 版本适用于 Spring Boot 2.2.x
 * 2020.x 版本适用于 Spring Boot 2.4.x
-* 2022.x 版本适用于 Spring Boot 2.6.x
+* 2021.x 版本适用于 Spring Boot 2.6.x
 
 ## 社区交流
 

README.md

@@ -53,7 +53,7 @@ In addition to the above-mentioned features, for the needs of enterprise users'
 For more features please refer to [Roadmap](https://github.com/alibaba/spring-cloud-alibaba/blob/master/Roadmap.md).
 
 ## How to build
-* **2022.x branch**: Corresponds to Spring Cloud 2021 & Spring Boot 2.6.x. JDK 1.8 or later versions are supported.
+* **2021.x branch**: Corresponds to Spring Cloud 2021 & Spring Boot 2.6.x. JDK 1.8 or later versions are supported.
 * **2020.0 branch**: Corresponds to Spring Cloud 2020 & Spring Boot 2.4.x. JDK 1.8 or later versions are supported.
 * **2.2.x branch**: Corresponds to Spring Cloud Hoxton & Spring Boot 2.2.x. JDK 1.8 or later versions are supported.
 * **greenwich branch**: Corresponds to Spring Cloud Greenwich & Spring Boot 2.1.x. JDK 1.8 or later versions are supported.
@@ -123,7 +123,7 @@ As the interfaces and annotations of Spring Boot 1 and Spring Boot 2 have been c
 * 2.1.x for Spring Boot 2.1.x
 * 2.2.x for Spring Boot 2.2.x
 * 2020.x for Spring Boot 2.4.x
-* 2022.x for Spring Boot 2.6.x
+* 2021.x for Spring Boot 2.6.x
 
 ## Code of Conduct
 This project is a sub-project of Spring Cloud, it adheres to the Contributor Covenant [code of conduct](https://github.com/spring-cloud/spring-cloud-build/blob/master/docs/src/main/asciidoc/code-of-conduct.adoc). By participating, you are expected to uphold this code. Please report unacceptable behavior to spring-code-of-conduct@pivotal.io.

spring-cloud-alibaba-docs/src/main/asciidoc-zh/sca-upgrade-guide.adoc

@@ -98,7 +98,7 @@ Add a spring.config.import=nacos: property to your configuration.
 
 - 假如想保留以前的使用方式 (bootstrap引入配置)，你只需要添加依赖 `spring-cloud-starter-bootstrap` 依赖，不需要修改一行代码
 
-你可以前往 https://github.com/alibaba/spring-cloud-alibaba/tree/2022.x/spring-cloud-alibaba-examples/nacos-example/nacos-config-2.4.x-example[这里] 查看具体example
+你可以前往 https://github.com/alibaba/spring-cloud-alibaba/tree/2021.x/spring-cloud-alibaba-examples/nacos-example/nacos-config-2.4.x-example[这里] 查看具体example
 
 ==== Nacos 容错能力
 
@@ -178,7 +178,7 @@ feign:
 
 *注意事项：* 如果你使用的是 `spring-cloud-starter-alibaba-sentinel`，请**不要**配置 `feign.sentinel.enable=true`，会使配置失效
 
-你可以前往 https://github.com/alibaba/spring-cloud-alibaba/tree/2022.x/spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example[这里] 查看具体 example
+你可以前往 https://github.com/alibaba/spring-cloud-alibaba/tree/2021.x/spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example[这里] 查看具体 example
 
 === 对升级的一点建议
 1. 在 spring boot 2.6 之后默认开启了禁止循环引入，建议大家不要关闭，这是一种不好的编码习惯，如果你的项目里出现了循环引用，请选择重构它

spring-cloud-alibaba-docs/src/main/asciidoc/sca-upgrade-guide.adoc

@@ -98,7 +98,7 @@ You can manually turn it off by setting `spring.cloud.nacos.config.import-check.
 
 - If you want to keep the previous usage (bootstrap way), you only need to add the dependency `spring-cloud-starter-bootstrap` dependency and don't need modifying a line of code.
 
-you can go https://github.com/alibaba/spring-cloud-alibaba/tree/2022.x/spring-cloud-alibaba-examples/nacos-example/nacos-config-2.4.x-example[here] to see the complete example.
+you can go https://github.com/alibaba/spring-cloud-alibaba/tree/2021.x/spring-cloud-alibaba-examples/nacos-example/nacos-config-2.4.x-example[here] to see the complete example.
 
 ==== Nacos Failure Tolerance
 
@@ -177,7 +177,7 @@ This feature also supports dynamic refresh from the configuration center. You ca
 
 *Note:* If you are using `spring-cloud-starter-alibaba-sentinel`, please *DO NOT* configure `feign.sentinel.enable=true`, it will invalidate the configuration.
 
-You can go https://github.com/alibaba/spring-cloud-alibaba/tree/2022.x/spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example[here] to see the complete example.
+You can go https://github.com/alibaba/spring-cloud-alibaba/tree/2021.x/spring-cloud-alibaba-examples/sentinel-example/sentinel-circuitbreaker-example[here] to see the complete example.
 
 === Little Advice For Upgrading
 1. After Spring Boot 2.6, the prohibition of circular reference is enabled by default. It is recommended that you do not change it. This is a bad coding practice. If there is a circular reference in your project, please choose to refactor it.