Update docs against 16863

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

en/application-dev/task-management/work-scheduler-dev-guide.md

@@ -59,6 +59,7 @@ onWorkStop(work: WorkInfo): void | Called when the Work Scheduler task stops.
    ```
    
    Import the **WorkSchedulerExtensionAbility** module.
+   
    ```js
    import WorkSchedulerExtensionAbility from '@ohos.WorkSchedulerExtensionAbility';
    ```
@@ -78,7 +79,6 @@ onWorkStop(work: WorkInfo): void | Called when the Work Scheduler task stops.
    }
    ```
 
-
 3. Start a Work Scheduler task.
 
    ```ts
@@ -106,7 +106,6 @@ onWorkStop(work: WorkInfo): void | Called when the Work Scheduler task stops.
    }
    ```
 
-
 4. Stop the Work Scheduler task.
 
    ```ts
@@ -132,10 +131,8 @@ onWorkStop(work: WorkInfo): void | Called when the Work Scheduler task stops.
    } catch (error) {
      console.error(`workschedulerLog stopWork failed. code is ${error.code} message is ${error.message}`);
    }
-   
    ```
 
-
 5. Obtain a specified Work Scheduler task.
 
    ```ts
@@ -187,7 +184,7 @@ onWorkStop(work: WorkInfo): void | Called when the Work Scheduler task stops.
    try{
      workScheduler.isLastWorkTimeOut(500, (error, res) =>{
        if (error) {
-         onsole.error(`workschedulerLog isLastWorkTimeOut failed. code   is ${error.code} message is ${error.message}`);
+         console.error(`workschedulerLog isLastWorkTimeOut failed. code is ${error.code} message is ${error.message}`);
        } else {
          console.info(`workschedulerLog isLastWorkTimeOut success, data is: ${res}`);
        }