Configuration information wrong (#2804)

Removed ribbon.nacos.enabled in 2021.x branch configuration

Co-authored-by: Steve Rao <raozihao.rzh@alibaba-inc.com>

spring-cloud-alibaba-examples/nacos-example/nacos-discovery-example/readme-zh.md

@@ -202,7 +202,6 @@ Metadata|spring.cloud.nacos.discovery.metadata||使用Map格式配置
 接入点|spring.cloud.nacos.discovery.endpoint||地域的某个服务的入口域名，通过此域名可以动态地拿到服务端地址
 是否集成LoadBalancer|spring.cloud.loadbalancer.nacos.enabled|false|
 是否开启Nacos Watch|spring.cloud.nacos.discovery.watch.enabled|true|可以设置成false来关闭 watch
-是否集成Ribbon|ribbon.nacos.enabled|true|
 是否启用Nacos|spring.cloud.nacos.discovery.enabled|true|默认启动，设置为false时会关闭自动向Nacos注册的功能
 
 

spring-cloud-alibaba-examples/nacos-example/nacos-discovery-example/readme.md

@@ -210,7 +210,6 @@ cluster|spring.cloud.nacos.discovery.cluster-name|DEFAULT|Nacos cluster name
 endpoint|spring.cloud.nacos.discovery.endpoint||The domain name of a service, through which the server address can be dynamically obtained.
 Integration LoadBalancer|spring.cloud.loadbalancer.nacos.enabled|false|
 enable Nacos Watch|spring.cloud.nacos.discovery.watch.enabled|true|Switch it to false to disable nacos watch
-Integration Ribbon|ribbon.nacos.enabled|true|
 enabled|spring.cloud.nacos.discovery.enabled|true|The switch to enable or disable nacos service discovery