update docs against 7039

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

en/application-dev/reference/apis/js-apis-application-abilityManager.md

@@ -7,7 +7,7 @@ The **AbilityManager** module provides APIs for obtaining, adding, and modifying
 > The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version. 
 > The APIs of this module are system APIs and cannot be called by third-party applications.
 
-# Modules to Import
+## Modules to Import
 
 ```js
 import AbilityManager from '@ohos.application.abilityManager'
@@ -19,6 +19,8 @@ Enumerates the ability states.
 
 **System capability**: SystemCapability.Ability.AbilityRuntime.Core
 
+**System API**: This is a system API and cannot be called by third-party applications.
+
 | Name| Value| Description| 
 | -------- | -------- | -------- |
 | INITIAL | 0 | The ability is in the initial state.|