update watch doc

core/src/main/java/com/taobao/arthas/core/command/Constants.java

@@ -2,6 +2,7 @@ package com.taobao.arthas.core.command;
 
 /**
  * @author ralf0131 2016-12-14 17:21.
+ * @author hengyunabc 2018-12-03
  */
 public interface Constants {
 
@@ -12,7 +13,8 @@ public interface Constants {
             "          target : the object\n" +
             "           clazz : the object's class\n" +
             "          method : the constructor or method\n" +
-            "    params[0..n] : the parameters of method\n" +
+            "          params : the parameters array of method\n" +
+            "    params[0..n] : the element of parameters array\n" +
             "       returnObj : the returned object of method\n" +
             "        throwExp : the throw exception of method\n" +
             "        isReturn : the method ended by return\n" +
@@ -26,6 +28,7 @@ public interface Constants {
     String WIKI_HOME = "  https://alibaba.github.io/arthas/";
 
     String EXPRESS_EXAMPLES =   "Examples:\n" +
+                                "  params\n" +
                                 "  params[0]\n" +
                                 "  'params[0]+params[1]'\n" +
                                 "  returnObj\n" +

site/src/site/sphinx/en/watch.md

@@ -37,6 +37,8 @@ Advanced:
 
 ### Usage
 
+#### Start Demo
+
 Start `arthas-demo` in [Quick Start](quick-start.md).
 
 #### Check the `out parameters` and `return value`
@@ -223,7 +225,7 @@ ts=2018-12-03 19:41:52; [cost=0.477882ms] result=@MathGame[
 
 * `target.field_name`: the field of the current object.
 
-```
+```bash
 $ watch demo.MathGame primeFactors 'target.illegalArgumentCount'
 Press Ctrl+C to abort.
 Affect(class-cnt:1 , method-cnt:1) cost in 67 ms.

site/src/site/sphinx/watch.md

@@ -38,6 +38,8 @@ watch 的参数比较多，主要是因为它能在 4 个不同的场景观察
 
 ### 使用参考
 
+#### 启动 Demo
+
 启动[快速入门](quick-start.md)里的`arthas-demo`。
 
 #### 观察方法出参和返回值
@@ -223,7 +225,7 @@ ts=2018-12-03 19:41:52; [cost=0.477882ms] result=@MathGame[
 
 然后使用`target.field_name`访问当前对象的某个属性
 
-```
+```bash
 $ watch demo.MathGame primeFactors 'target.illegalArgumentCount'
 Press Ctrl+C to abort.
 Affect(class-cnt:1 , method-cnt:1) cost in 67 ms.