Update docs against 15216

Signed-off-by: wusongqing<wusongqing@huawei.com>

en/application-dev/reference/apis/js-apis-resourceschedule-deviceUsageStatistics.md

@@ -133,6 +133,8 @@ Queries the group of this application. This API uses a promise to return the res
 
 **System capability**: SystemCapability.ResourceSchedule.UsageStatistics.AppGroup
 
+**System API**: This is a system API.
+
 **Return value**
 
 | Type             | Description                         |
@@ -175,6 +177,8 @@ Queries the group of this application. This API uses an asynchronous callback to
 
 **System capability**: SystemCapability.ResourceSchedule.UsageStatistics.AppGroup
 
+**System API**: This is a system API.
+
 **Parameters**
 
 | Name     | Type                   | Mandatory  | Description                        |
@@ -552,6 +556,8 @@ Queries events of this application based on the specified start time and end tim
 
 **System capability**: SystemCapability.ResourceSchedule.UsageStatistics.App
 
+**System API**: This is a system API.
+
 **Parameters**
 
 | Name     | Type                                      | Mandatory  | Description                                     |
@@ -601,6 +607,8 @@ Queries events of this application based on the specified start time and end tim
 
 **System capability**: SystemCapability.ResourceSchedule.UsageStatistics.App
 
+**System API**: This is a system API.
+
 **Parameters**
 
 | Name  | Type    | Mandatory  | Description   |
@@ -1558,6 +1566,8 @@ Provides information about an application event.
 
 **System capability**: SystemCapability.ResourceSchedule.UsageStatistics.App
 
+**System API**: This is a system API.
+
 | Name                  | Type    | Mandatory  | Description                                      |
 | --------------------- | ------ | ---- | ---------------------------------------- |
 | bundleName            | string | Yes   | Bundle name of the application.                                   |