Update docs against 17164+17603

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

en/application-dev/application-models/extensionability-overview.md

@@ -25,7 +25,8 @@ An [ExtensionAbilityType](../reference/apis/js-apis-bundleManager.md#extensionab
 
 - [EnterpriseAdminExtensionAbility](../reference/apis/js-apis-EnterpriseAdminExtensionAbility.md): ExtensionAbility component of the enterprise_admin type, which provides APIs for processing enterprise management events, such as application installation events on devices and events indicating too many incorrect screen-lock password attempts.
 
-> **NOTE**<br>
+> **NOTE**
+>
 > 1. Third-party applications cannot implement ServiceExtensionAbility, DataShareExtensionAbility, StaticSubscriberExtensionAbility, or WindowExtensionAbility.
 >
 > 2. To implement transaction processing in the background for a third-party application, use background tasks rather than ServiceExtensionAbility. For details, see [Background Task](../task-management/background-task-overview.md).
@@ -45,7 +46,7 @@ The following uses [InputMethodExtensionAbility](../reference/apis/js-apis-input
 
 ## Implementing ExtensionAbility of the Specified Type
 
-The following uses [FormExtensionAbility](../reference/apis/js-apis-app-form-formExtensionAbility.md) as an example. The widget framework provides the base class [FormExtensionAbility](../reference/apis/js-apis-app-form-formExtensionAbility.md). You derive this base class to create your own class (such as **MyFormExtensionAbility**), implement the callbacks, such as **onCreate()** and **onUpdateForm()**, to provide specific widget functionalities. For details, see [FormExtensionAbility](Widget-development-stage.md).
+The following uses [FormExtensionAbility](../reference/apis/js-apis-app-form-formExtensionAbility.md) as an example. The widget framework provides the base class [FormExtensionAbility](../reference/apis/js-apis-app-form-formExtensionAbility.md). You derive this base class to create your own class (such as **MyFormExtensionAbility**), implement the callbacks, such as **onCreate()** and **onUpdateForm()**, to provide specific widget functionalities. For details, see [FormExtensionAbility](service-widget-overview.md).
 
 You do not need to care when to add or delete a widget. The lifecycle of the FormExtensionAbility instance and the lifecycle of the ExtensionAbility process where the FormExtensionAbility instance is located are scheduled and managed by FormManagerService.
 
@@ -63,3 +64,5 @@ You do not need to care when to add or delete a widget. The lifecycle of the For
 > - The two FormExtensionAbility components run in an independent process.
 > 
 > - The two ImeExtensionAbility components run in an independent process.
+
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