docs: fix markdown code blocks by change 4 back quote to 3 back quote (…

…#4631)

docs/en/deployment/deployment-architecture.md

@@ -901,7 +901,7 @@ flowchart LR
 	
 	idc2-JVM8070 --> idc2-c1-jvm-8090
 	idc2-JVM8070 --> idc2-c2-jvm-8090
-````
+```
 
 Each server room has its own set of Portal, Config Service, Admin Service
 

docs/en/deployment/distributed-deployment-guide.md

@@ -509,7 +509,7 @@ Remember to set a JVM memory according to the actual environment in scripts/star
 
 ```bash
 export JAVA_OPTS="-server -Xms6144m -Xmx6144m -Xss256k -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=384m -XX:NewSize=4096m -XX:MaxNewSize=4096m -XX:SurvivorRatio=18"
-````
+```
 
 > Note 1: If you need to modify the JVM parameters, you can modify the `JAVA_OPTS` section of scripts/startup.sh.
 
@@ -529,7 +529,7 @@ Remember to set a JVM memory according to the actual environment in scripts/star
 
 ```bash
 export JAVA_OPTS="-server -Xms2560m -Xmx2560m -Xss256k -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=384m -XX:NewSize=1024m -XX:MaxNewSize=1024m -XX:SurvivorRatio=22"
-````
+```
 
 > Note 1: If you need to modify the JVM parameters, you can modify the `JAVA_OPTS` section of scripts/startup.sh.
 
@@ -545,7 +545,7 @@ Remember to set a JVM memory according to the actual environment in startup.sh.
 
 ```bash
 export JAVA_OPTS="-server -Xms4096m -Xmx4096m -Xss256k -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=384m -XX:NewSize=1536m -XX:MaxNewSize=1536m -XX:SurvivorRatio=22"
-````
+```
 
 > Note 1: If you need to modify the JVM parameters, you can modify the `JAVA_OPTS` section of scripts/startup.sh.
 
@@ -1000,7 +1000,7 @@ The following table lists the configurable parameters of the apollo-service-char
 
 ###### 2.4.1.3.4.1 The host of ConfigDB is the IP outside the k8s cluster
 
-````yaml
+```yaml
 configdb:
   host: 1.2.3.4
   dbName: ApolloConfigDBName
@@ -1009,11 +1009,11 @@ configdb:
   connectionStringProperties: characterEncoding=utf8&useSSL=false
   service:
     enabled: true
-````
+```
 
 ###### 2.4.1.3.4.2 The host of ConfigDB is the domain name outside the k8s cluster
 
-````yaml
+```yaml
 configdb:
   host: xxx.mysql.rds.aliyuncs.com
   dbName: ApolloConfigDBName
@@ -1023,42 +1023,42 @@ configdb:
   service:
     enabled: true
     type: ExternalName
-````
+```
 
 ###### 2.4.1.3.4.3 The host of ConfigDB is a service in the k8s cluster
 
-````yaml
+```yaml
 configdb:
   host: apollodb-mysql.mysql
   dbName: ApolloConfigDBName
   userName: someUserName
   password: somePassword
   connectionStringProperties: characterEncoding=utf8&useSSL=false
-````
+```
 
 ###### 2.4.1.3.4.4 Specify the apollo-configservice address returned by Meta Server
 
 If apollo-client cannot directly access the service of apollo-configservice (for example, it is not in the same k8s cluster), you can refer to the following example to specify the address returned by Meta Server to apollo-client (for example, it can be accessed through nodeport)
 
-````yaml
+```yaml
 configService:
   config:
     configServiceUrlOverride: http://1.2.3.4:12345
-````
+```
 
 ###### 2.4.1.3.4.5 Specify the apollo-adminservice address returned by Meta Server
 
 If apollo-portal cannot directly access the service of apollo-adminservice (for example, it is not in the same k8s cluster), you can refer to the following example to specify the address returned by Meta Server to apollo-portal (for example, it can be accessed through nodeport)
 
-````yaml
+```yaml
 configService:
   config:
     adminServiceUrlOverride: http://1.2.3.4:23456
-````
+```
 
 ###### 2.4.1.3.4.6 Expose apollo-configservice service in the form of Ingress configuration custom path `/config`
 
-````yaml
+```yaml
 # use /config as root, should specify configService.config.contextPath as /config
 configService:
   config:
@@ -1068,11 +1068,11 @@ configService:
     hosts:
       - paths:
           - /config
-````
+```
 
 ###### 2.4.1.3.4.7 Expose apollo-adminservice service in the form of Ingress configuration custom path `/admin`
 
-````yaml
+```yaml
 # use /admin as root, should specify adminService.config.contextPath as /admin
 adminService:
   config:
@@ -1082,7 +1082,7 @@ adminService:
     hosts:
       - paths:
           - /admin
-````
+```
 
 #### 2.4.1.4 Deploy apollo-portal
 
@@ -1102,13 +1102,13 @@ $ helm install apollo-portal \
     --set replicaCount=1 \
     -n your-namespace \
     apollo/apollo-portal
-````
+```
 
 General deployment recommendations are configured through values.yaml:
 
 ```bash
 $ helm install apollo-portal -f values.yaml -n your-namespace apollo/apollo-portal
-````
+```
 
 > For more configuration item descriptions, please refer to [2.4.1.4.3 Configuration item description](
 
@@ -1173,7 +1173,7 @@ The following table lists the configurable parameters of the apollo-portal chart
 
 ###### 2.4.1.4.4.1 The host of PortalDB is the IP outside the k8s cluster
 
-````yaml
+```yaml
 portaldb:
   host: 1.2.3.4
   dbName: ApolloPortalDBName
@@ -1182,11 +1182,11 @@ portaldb:
   connectionStringProperties: characterEncoding=utf8&useSSL=false
   service:
     enabled: true
-````
+```
 
 ###### 2.4.1.4.4.2 The host of PortalDB is the domain name outside the k8s cluster
 
-````yaml
+```yaml
 portaldb:
   host: xxx.mysql.rds.aliyuncs.com
   dbName: ApolloPortalDBName
@@ -1196,49 +1196,49 @@ portaldb:
   service:
     enabled: true
     type: ExternalName
-````
+```
 
 ###### 2.4.1.4.4.3 The host of PortalDB is a service in the k8s cluster
 
-````yaml
+```yaml
 portaldb:
   host: apollodb-mysql.mysql
   dbName: ApolloPortalDBName
   userName: someUserName
   password: somePassword
   connectionStringProperties: characterEncoding=utf8&useSSL=false
-````
+```
 
 ###### 2.4.1.4.4.4 Configure environment information
 
-````yaml
+```yaml
 config:
   envs: dev, pro
   metaServers:
     dev: http://apollo-service-dev-apollo-configservice:8080
     pro: http://apollo-service-pro-apollo-configservice:8080
-````
+```
 
 ###### 2.4.1.4.4.5 Expose services as Load Balancer
 
-````yaml
+```yaml
 service:
   type: LoadBalancer
-````
+```
 
 ###### 2.4.1.4.4.6 Expose services as Ingress
 
-````yaml
+```yaml
 ingress:
   enabled: true
   hosts:
     - paths:
         - /
-````
+```
 
 ###### 2.4.1.4.4.7 Expose services in the form of Ingress configuration custom path `/apollo`
 
-````yaml
+```yaml
 # use /apollo as root, should specify config.contextPath as /apollo
 ingress:
   enabled: true
@@ -1250,11 +1250,11 @@ config:
   ...
   contextPath: /apollo
   ...
-````
+```
 
 ###### 2.4.1.4.4.8 Expose services in the form of Ingress configuration session affinity
 
-````yaml
+```yaml
 ingress:
   enabled: true
   annotations:
@@ -1268,11 +1268,11 @@ ingress:
     - host: xxx.somedomain.com # host is required to make session affinity work
       paths:
         - /
-````
+```
 
 ###### 2.4.1.4.4.9 Enable LDAP support
 
-````yaml
+```yaml
 config:
   ...
   profiles: github,ldap
@@ -1293,7 +1293,7 @@ config:
           loginId: "uid"
           userDisplayName: "cn"
           email: "mail"
-````
+```
 
 #### 2.4.1.5 Building a Docker image from source
 

docs/en/deployment/quick-start.md

@@ -24,7 +24,7 @@ Sample output.
 java version "1.8.0_74"
 Java(TM) SE Runtime Environment (build 1.8.0_74-b02)
 Java HotSpot(TM) 64-Bit Server VM (build 25.74-b02, mixed mode)
-````
+```
 
 Windows users please make sure that JAVA_HOME environment variable is set.
 

docs/en/design/apollo-core-concept-namespace.md

@@ -173,33 +173,33 @@ As you can see in the above code example, the Client Namespace is mapped to a Co
 
 So the Namespace code that monitors the application in application A is as follows:
 
-````java
+```java
 Config appConfig = ConfigService.getAppConfig();
 appConfig.addChangeListener(new ConfigChangeListener() {
   public void onChange(ConfigChangeEvent changeEvent) {
     //do something
   }
 })
-````
+```
 
 The Namespace code for monitoring NS-Private in application A is as follows:
 
-````java
+```java
 Config privateConfig = ConfigService.getConfig("NS-Private");
 privateConfig.addChangeListener(new ConfigChangeListener() {
   public void onChange(ConfigChangeEvent changeEvent) {
     //do something
   }
 })
-````
+```
 
 The Namespace code for monitoring NS-Public in application A, application B, and application C is as follows:
 
-````java
+```java
 Config publicConfig = ConfigService.getConfig("NS-Public");
 publicConfig.addChangeListener(new ConfigChangeListener() {
   public void onChange(ConfigChangeEvent changeEvent) {
     //do something
   }
 })
-````
+```

docs/en/design/apollo-introduction.md

@@ -138,19 +138,19 @@ Fill in the release information:
 
 After the configuration is released, it can be obtained on the client side. Taking Java as an example, the sample code for obtaining the configuration is as follows. Apollo client also supports integration with Spring. For more client usage instructions, please refer to [Java Client Usage Guide](en/usage/java-sdk-user-guide) and [.Net Client Usage Guide](en/usage/dotnet-sdk-user-guide).
 
-````java
+```java
 Config config = ConfigService.getAppConfig();
 Integer defaultRequestTimeout = 200;
 Integer requestTimeout = config.getIntProperty("requestTimeout", defaultRequestTimeout);
-````
+```
 
 ## 3.6 Client monitoring configuration changes
 
 By obtaining the configuration code above, the application can obtain the latest configuration in real time.
 
 However, in some scenarios, the application also needs to be notified when the configuration changes, such as the switching of database connections, so Apollo also provides the function of monitoring configuration changes. The Java example is as follows:
 
-````java
+```java
 Config config = ConfigService.getAppConfig();
 config.addChangeListener(new ConfigChangeListener() {
   @Override
@@ -164,26 +164,26 @@ config.addChangeListener(new ConfigChangeListener() {
      }
   }
 });
-````
+```
 
 ## 3.7 Spring integration example
 
 Apollo and Spring can also be easily integrated. You only need to mark `@EnableApolloConfig` to get configuration information through `@Value`:
 
-````java
+```java
 @Configuration
 @EnableApolloConfig
 public class AppConfig {}
-````
+```
 
-````java
+```java
 @Component
 public class SomeBean {
     //The value of timeout will be updated automatically
     @Value("${request.timeout:200}")
     private int timeout;
 }
-````
+```
 
 # 4. Apollo in depth
 

docs/en/development/portal-how-to-enable-email-service.md

@@ -61,7 +61,7 @@ The following are the template content styles for publishing emails and rolling
 
 ```html
 <html><head><style type="text/css">.table{width:100%;max-width:100%;margin-bottom:20px;border-collapse:collapse;background-color:transparent}td {padding:8px;line-height:1.42857143;vertical-align:top;border:1px solid #ddd;border-top:1px solid #ddd}.table-bordered{border:1px solid #ddd}</style>< /head><body><h3>Post basic information</h3><table class="table table-bordered"><tr><td width="10%"><b>AppId</b></td ><td width="15%">#{appId}</td><td width="10%"><b>Environment</b></td><td width="15%">#{ env}</td><td width="10%"><b>cluster</b></td><td width="15%">#{clusterName}</td><td width="10 %"><b>Namespace</b></td><td width="15%">#{namespaceName}</td></tr><tr><td><b>Publisher</b ></td><td>#{operator}</td><td><b>release time</b></td><td>#{releaseTime}</td><td><b>release Title</b></td><td>#{releaseTitle}</td><td><b>Comment</b></td><td>#{releaseComment}</td></tr> </table>#{diffModule}#{rulesModule}<br><a href="#{apollo.portal.address}/config/history.html?#/appid=#{appId}&env=#{env}&clusterName =#{clusterName}&namespaceName=#{namespaceName}&releaseHistoryId=#{ releaseHistoryId}">Click to view detailed release information</a><br><br>If you have any questions about using Apollo, please check <a href="http://conf.ctripcorp.com/display/FRAM/Apollo"> document</a>, or reply directly to this email inquiry. </body></html>
-````
+```
 
 > Note: To use this template, you need to configure apollo.portal.address in the system parameters of the portal to point to the address of the apollo portal