update en/application-dev/ability/wantagent.md.

Signed-off-by: Nking_he <6384784@qq.com>

en/application-dev/ability/wantagent.md

 # WantAgent Development
+
 ### Introduction
-The **WantAgent** class encapsulates a **Want** object that specifies a particular action. To trigger a **WantAgent**, you can either call **wantAgent.trigger** to trigger it directly or add it to a notification so that it will be triggered when users tap the notification.
+The **WantAgent** class encapsulates a **Want** object that specifies a particular action. You can trigger a **WantAgent** by calling **wantAgent.trigger** directly or by adding it to a notification so that it is triggered when a user taps the notification.
 
 You can use a **WantAgent** in a notification to start an ability or publish a common event.
 
@@ -69,4 +70,4 @@ var triggerInfo = {
 wantAgent.trigger(wantAgentObj, triggerInfo, (completeData) => {
     console.log("[WantAgent]getWantAgent success, completeData: ",  + JSON.stringify(completeData))
 })
-```
+```
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