update zh-cn/application-dev/reference/apis/js-apis-resourceschedule-backgroundTaskManager.md.

Signed-off-by: Nningning <3248127340@qq.com>

zh-cn/application-dev/reference/apis/js-apis-resourceschedule-backgroundTaskManager.md

@@ -76,7 +76,7 @@ requestSuspendDelay(reason: string, callback: Callback<void>): DelaySuspen
   ```
 
 
-## backgroundTaskManager.getRemainingDelayTime:callback
+## backgroundTaskManager.getRemainingDelayTime
 
 getRemainingDelayTime(requestId: number, callback: AsyncCallback<number>): void
 
@@ -125,7 +125,7 @@ getRemainingDelayTime(requestId: number, callback: AsyncCallback<number>):
   ```
 
 
-## backgroundTaskManager.getRemainingDelayTime:promise
+## backgroundTaskManager.getRemainingDelayTime
 
 getRemainingDelayTime(requestId: number): Promise<number>
 
@@ -219,7 +219,7 @@ cancelSuspendDelay(requestId: number): void
   ```
 
 
-## backgroundTaskManager.startBackgroundRunning:callback
+## backgroundTaskManager.startBackgroundRunning
 
 startBackgroundRunning(context: Context, bgMode: BackgroundMode, wantAgent: WantAgent, callback: AsyncCallback<void>): void
 
@@ -297,7 +297,7 @@ export default class EntryAbility extends UIAbility {
 };
 ```
 
-## backgroundTaskManager.startBackgroundRunning:promise
+## backgroundTaskManager.startBackgroundRunning
 
 startBackgroundRunning(context: Context, bgMode: BackgroundMode, wantAgent: WantAgent): Promise<void>
 
@@ -376,7 +376,7 @@ export default class EntryAbility extends UIAbility {
 };
 ```
 
-## backgroundTaskManager.stopBackgroundRunning:callback
+## backgroundTaskManager.stopBackgroundRunning
 
 stopBackgroundRunning(context: Context, callback: AsyncCallback<void>): void
 
@@ -430,7 +430,7 @@ export default class EntryAbility extends UIAbility {
 };
 ```
 
-## backgroundTaskManager.stopBackgroundRunning:promise
+## backgroundTaskManager.stopBackgroundRunning
 
 stopBackgroundRunning(context: Context): Promise<void>