Doc: fix typo in README (#421)

docs/zh_cn/README.md

@@ -33,7 +33,7 @@ JuiceFS 是一款高性能 [POSIX](https://en.wikipedia.org/wiki/POSIX) 文件
   - [Windows 系统使用 JuiceFS](juicefs_on_windows.md)
   - [macOS 系统使用 JuiceFS](juicefs_on_macos.md)
   - [Docker 使用 JuiceFS](juicefs_on_docker.md)
-  - [Kubernets 使用 JuiceFS](juicefs_on_kubernetes.md)
+  - [Kubernetes 使用 JuiceFS](how_to_use_on_kubernetes.md)
   - [Hadoop 使用 JuiceFS](hadoop_java_sdk.md)
   - [JuiceFS 启用 S3 Gateway](s3_gateway.md)
   - [JuiceFS 客户端编译和升级](client_compile_and_upgrade.md)

docs/zh_cn/juicefs_on_kubernetes.md → docs/zh_cn/how_to_use_on_kubernetes.md

@@ -229,4 +229,4 @@ scrape_configs:
 
 ### Configure Grafana dashboard
 
-We provide a [dashboard template](./k8s_grafana_template.json) for [Grafana](https://grafana.com), which can be imported to show the collected metrics in Prometheus.
\ No newline at end of file
+We provide a [dashboard template](./k8s_grafana_template.json) for [Grafana](https://grafana.com), which can be imported to show the collected metrics in Prometheus.