update docs

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

en/application-dev/background-agent-scheduled-reminder/Readme-EN.md

-# Agent-Powered Scheduled Reminder 
-
-- [Agent-Powered Scheduled Reminder Overview](background-agent-scheduled-reminder-overview.md)
-- [Agent-Powered Scheduled Reminder Development](background-agent-scheduled-reminder-guide.md)
-

en/application-dev/background-task-management/Readme-EN.md

-# Background Task Management 
-
-- [Background Task Management Overview](background-task-overview.md)
-- [Background Task Management Development](background-task-dev-guide.md)
\ No newline at end of file

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

@@ -3,4 +3,7 @@
 - [Common Event and Notification Overview](notification-brief.md)
 - [Common Event Development](common-event.md)
 - [Notification Development](notification.md)
+- Agent-Powered Scheduled Reminder 
+  - [Agent-Powered Scheduled Reminder Overview](background-agent-scheduled-reminder-overview.md)
+  - [Agent-Powered Scheduled Reminder Development](background-agent-scheduled-reminder-guide.md)
 - [Debugging Assistant Usage](assistant-guidelines.md)

en/application-dev/background-agent-scheduled-reminder/background-agent-scheduled-reminder-overview.md → en/application-dev/notification/background-agent-scheduled-reminder-overview.md

-# Agent-Powered Scheduled Reminder Overview<a name="EN-US_TOPIC_0000001139084594"></a>
+# Agent-Powered Scheduled Reminder Overview
 
 Your application can call the  **ReminderRequest**  class to create scheduled reminders for countdown timers, calendar events, and alarm clocks. When the created reminders are published, the timing and pop-up notification functions of your application will be taken over by the reminder agent in the background, even when your application is frozen or exits.
 

en/application-dev/task-management/Readme-EN.md

+# Task Management
+- Background Task Management 
+  - [Background Task Management Overview](background-task-overview.md)
+  - [Background Task Management Development](background-task-dev-guide.md)
+- Work Scheduler
+  - [Work Scheduler Overview](work-scheduler-overview.md)
+  - [Work Scheduler Development](work-scheduler-dev-guide.md)
+

en/application-dev/work-scheduler/Readme-EN.md

-# Work Scheduler
- - [Work Scheduler Overview](work-scheduler-overview.md)
- - [Work Scheduler Development](work-scheduler-dev-guide.md)
-