delete DataShareExtensionAbility

Signed-off-by: Nliuliu <liuliu40@huawei.com>
Change-Id: I447252c061c163c214d765eb86c0ed87319d05f1

zh-cn/application-dev/application-models/datashareextensionability.md

-# DataShareExtensionAbility（仅对系统应用开放）
-
-
-DataShareExtensionAbility提供了数据分享的能力，系统应用可以实现一个DataShareExtensionAbility，也可以访问系统中已有的DataShareExtensionAbility，针对三方应用仅开放访问系统中已有DataShareExtensionAbility的能力，详细介绍请参见[同设备跨应用数据共享](../database/share-device-data-across-apps-overview.md)。

zh-cn/application-dev/website.md

@@ -85,7 +85,6 @@
         - ExtensionAbility组件
           - [ExtensionAbility组件概述](application-models/extensionability-overview.md)
           - [ServiceExtensionAbility](application-models/serviceextensionability.md)
-          - [DataShareExtensionAbility（仅对系统应用开放）](application-models/datashareextensionability.md)
           - [FormExtensionAbility（服务卡片）](application-models/widget-development-stage.md)
           - [AccessibilityExtensionAbility](application-models/accessibilityextensionability.md)
           - [InputMethodExtensionAbility](application-models/inputmethodextentionability.md)