Added English fa-formability

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

en/application-dev/ability/Readme-EN.md

@@ -5,6 +5,6 @@
    - [Page Ability Development](fa-pageability.md)
    - [Service Ability Development](fa-serviceability.md)
    - [Data Ability Development](fa-dataability.md)
-   - [Form Ability Development](fa-formability.md)
+   - [FA Widget Development](fa-formability.md)
  - Other
    - [Ability Assistant Usage](ability-assistant-guidelines.md)

en/application-dev/ability/fa-formability.md

-# Form Ability Development
+# FA Widget Development
 
 ## Widget Overview
 A Form ability presents a widget, which is a set of UI components used to display important information or operations for an application. It provides users with direct access to a desired application service, without requiring them to open the application.