fix typo and doc format of README file (#3688)

1. It’s a little weird to use Chinese comma in English
2. Fix typo:   change 'reposity' to  'repository', 'instance' to 'instances'
3. Format other details of the doc

README.md

@@ -1,5 +1,5 @@
 
-<img src="doc/Nacos_Logo.png" width="50%" height="50%" />
+<img src="doc/Nacos_Logo.png" width="50%" syt height="50%" />
 
 # Nacos: Dynamic  *Na*ming and *Co*nfiguration *S*ervice
 
@@ -12,48 +12,48 @@
 
 Nacos (official site: [http://nacos.io](http://nacos.io)) is an easy-to-use platform designed for dynamic service discovery and configuration and service management. It helps you to build cloud native applications and microservices platform easily.
 
-Service is a first-class citizen in Nacos. Nacos supports almost all type of services，for example，[Dubbo/gRPC service](https://nacos.io/en-us/docs/use-nacos-with-dubbo.html)、[Spring Cloud RESTFul service](https://nacos.io/en-us/docs/use-nacos-with-springcloud.html) or [Kubernetes service](https://nacos.io/en-us/docs/use-nacos-with-kubernetes.html).
+Service is a first-class citizen in Nacos. Nacos supports almost all type of services，for example，[Dubbo/gRPC service](https://nacos.io/en-us/docs/use-nacos-with-dubbo.html), [Spring Cloud RESTFul service](https://nacos.io/en-us/docs/use-nacos-with-springcloud.html) or [Kubernetes service](https://nacos.io/en-us/docs/use-nacos-with-kubernetes.html).
 
 Nacos provides four major functions.
 
 * **Service Discovery and Service Health Check** 
 
-    Nacos makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. Nacos also provides real-time healthchecks of services to prevent sending requests to unhealthy hosts or service instance.
+    Nacos makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. Nacos also provides real-time health checks of services to prevent sending requests to unhealthy hosts or service instances.
 
 * **Dynamic Configuration Management**
 
-  Dynamic Configuration Service allows you to manage configurations of all services in a centralized and dynamic manner across all environments. Nacos eliminates the need to redeploy applications and services when configurations are updated, which makes configuration changes more efficient and agile.
+    Dynamic Configuration Service allows you to manage configurations of all services in a centralized and dynamic manner across all environments. Nacos eliminates the need to redeploy applications and services when configurations are updated, which makes configuration changes more efficient and agile.
 
 * **Dynamic DNS Service**
-
-   Nacos supports weighted routing, making it easier for you to implement mid-tier load balancing, flexible routing policies, flow control, and simple DNS resolution services in the production environment within your data center. It helps you to implement DNS-based service discovery easily and prevent applications from coupling to vendor-specific service discovery APIs.
+    
+    Nacos supports weighted routing, making it easier for you to implement mid-tier load balancing, flexible routing policies, flow control, and simple DNS resolution services in the production environment within your data center. It helps you to implement DNS-based service discovery easily and prevent applications from coupling to vendor-specific service discovery APIs.
 
 * **Service and MetaData Management**
 
-	Nacos provides an easy-to-use service dashboard to help you manage your services metadata, configuration, kubernetes DNS, service health and metrics statistics.
+    Nacos provides an easy-to-use service dashboard to help you manage your services metadata, configuration, kubernetes DNS, service health and metrics statistics.
 
 
 ## Quick Start
 It is super easy to get started with your first project.
 
 #### Step 1: Download the binary package 
 
-You can download the package from the  [latest stable release](https://github.com/alibaba/nacos/releases).  
+You can download the package from the [latest stable release](https://github.com/alibaba/nacos/releases).  
 
-Take release nacos-server-1.0.0.zip for example.
-```
+Take release `nacos-server-1.0.0.zip` for example:
+```sh
 unzip nacos-server-1.0.0.zip
 cd nacos/bin 
 ``` 
 
 #### Step 2: Start Server
 
 On the **Linux/Unix/Mac** platform, run the following command to start server with standalone mode: 
-```
+```sh
 sh startup.sh -m standalone
 ```
 
-On the **Windows** platform, run the following command to start server with standalone mode.  Alternatively, you can also double-click the startup.cmd to run NacosServer.
+On the **Windows** platform, run the following command to start server with standalone mode.  Alternatively, you can also double-click the `startup.cmd` to run NacosServer.
 ```
 cmd startup.cmd -m standalone
 ```
@@ -74,7 +74,7 @@ For more details, see [quick-start.](https://nacos.io/en-us/docs/quick-start.htm
 
 You can view the full documentation from the [Nacos website](https://nacos.io/en-us/docs/what-is-nacos.html).
 
-All the latest and long-term notice can also be found here from [Github notice issue](https://github.com/alibaba/nacos/labels/notice)
+All the latest and long-term notice can also be found here from [Github notice issue](https://github.com/alibaba/nacos/labels/notice).
 
 
 ## Contributing
@@ -84,7 +84,7 @@ Contributors are welcomed to join Nacos project. Please check [CONTRIBUTING](./C
 ## Other Related Project Repositories
 
 * [nacos-spring-project](https://github.com/nacos-group/nacos-spring-project) provides the integration functionality for Spring.
-* [nacos-group](https://github.com/nacos-group) is the reposity that hosts the eco tools for Nacos, such as SDK, synchronization tool, etc.
+* [nacos-group](https://github.com/nacos-group) is the repository that hosts the eco tools for Nacos, such as SDK, synchronization tool, etc.
 * [spring-cloud-alibaba](https://github.com/spring-cloud-incubator/spring-cloud-alibaba) provides the one-stop solution for application development over Alibaba middleware which includes Nacos.
 
 ## Contact