modify the document (#1331)

* add document

* modify the document

* format document style

docs/cn/Deploy-skywalking-agent-CN.md

@@ -76,8 +76,14 @@ logging.level=DEBUG
 CATALINA_OPTS="$CATALINA_OPTS -javaagent:/path/to/skywalking-agent/skywalking-agent.jar"; export CATALINA_OPTS
 ```
 
-- Windows Tomcat7, Tomcat 8
+- Windows Tomcat 7, Tomcat 8  
 修改`tomcat/bin/catalina.bat`，在首行加入如下信息
 ```shell
-set "CATALINA_OPTS=... -javaagent:E:\apache-tomcat-8.5.20\skywalking-agent\skywalking-agent.jar"
+set "CATALINA_OPTS=-javaagent:/path/to/skywalking-agent/skywalking-agent.jar"
 ```
+- JAR 部署  
+修改启动命令添加启动参数`-javaagent`
+ ```shell
+ java -javaagent:/path/to/skywalking-agent/skywalking-agent.jar -jar yourApp.jar
+ ```
+

docs/en/Deploy-skywalking-agent.md

@@ -36,8 +36,13 @@ Change the first line of `tomcat/bin/catalina.sh`.
 CATALINA_OPTS="$CATALINA_OPTS -javaagent:/path/to/skywalking-agent/skywalking-agent.jar"; export CATALINA_OPTS
 ```
 
-- Windows Tomcat7, Tomcat 8
+- Windows Tomcat 7, Tomcat 8  
 Change the first line of `tomcat/bin/catalina.bat`.
 ```shell
-set "CATALINA_OPTS=-javaagent:E:\apache-tomcat-8.5.20\skywalking-agent\skywalking-agent.jar"
+set "CATALINA_OPTS=-javaagent:/path/to/skywalking-agent/skywalking-agent.jar"
 ```
+- JAR file  
+Add `-javaagent` argument to command line in which you start your app. And make sure to add it before the `-jar` argument. eg:
+ ```shell
+ java -javaagent:/path/to/skywalking-agent/skywalking-agent.jar -jar yourApp.jar
+ ```