update docs

spring-cloud-alibaba-docs/src/main/asciidoc/nacos-discovery.adoc

@@ -42,9 +42,11 @@ For more Nacos Server versions, you can download the latest version from https:/
 The following sample illustrates how to register a service to Nacos.
 
 * Configuration of pom.xml The following is a complete example of pom.xml:
-[source, xml]
+
+.pom.xml
+[source,xml]
 ----
-<?xml version="1.0" encoding="UTF-8"? >
+<?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
@@ -115,7 +117,8 @@ The following sample illustrates how to register a service to Nacos.
 ----
 
 * Configuration of application.properties Some of the basic configurations of Nacos must be included in application.properties(or application.yaml), as shown below：
-application.properties
+
+.application.properties
 [source,properties]
 ----
 server.port=8081
@@ -128,6 +131,7 @@ management.endpoints.web.exposure.include=*
 NOTE: If you do not want to use Nacos for service registration and discovery, you can set `spring.cloud.nacos.discovery` to `false`.
 
 * The following is a sample for starting Provider:
+
 [source,java,indent=0]
 ----
 @SpringBootApplication
@@ -294,10 +298,8 @@ The followings shows how a service instance accesses the Endpoint:
 
 The following shows the other configurations of the starter of Nacos Discovery:
 
-:frame: topbot
-[width="60%",options="header"]
-|====
-^|Configuration ^|Key ^|Default Value ^|Description
+|===
+|Configuration |Key |Default Value |Description
 |Server address|`spring.cloud.nacos.discovery.server-addr`||IP and port of the Nacos Server listener
 |Service name|`spring.cloud.nacos.discovery.service`|`${spring.application.name}`|Name the current service
 |Weight|`spring.cloud.nacos.discovery.weight`|`1`|Value range: 1 to 100. The bigger the value, the greater the weight
@@ -313,5 +315,5 @@ The following shows the other configurations of the starter of Nacos Discovery:
 |Endpoint|`spring.cloud.nacos.discovery.endpoint`||The domain name of a certain service in a specific region. You can retrieve the server address dynamically with this domain name
 |Integrate Ribbon or not|`ribbon.nacos.enabled`|`true`|Set to true in most cases
 |Enable Nacos Watch|`spring.cloud.nacos.discovery.watch.enabled`|`true`|set to false to close watch
-|====
+|===