update docs

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

zh-cn/application-dev/background-task-management/background-task-dev-guide.md

@@ -34,7 +34,7 @@ import backgroundTaskManager from '@ohos.backgroundTaskManager';
    import backgroundTaskManager from '@ohos.backgroundTaskManager';
    let myReason = 'test requestSuspendDelay';
    let delayInfo = backgroundTaskManager.requestSuspendDelay(myReason, () => {
-       console.info("Request suspend delay will time out.");
+       console.info("Request suspension delay will time out.");
    });
    var id = delayInfo.requestId;console.info("requestId is: " + id);
    ```
@@ -61,7 +61,7 @@ import backgroundTaskManager from '@ohos.backgroundTaskManager';
 let myReason = 'test requestSuspendDelay';
 // 申请延迟挂起
 let delayInfo = backgroundTaskManager.requestSuspendDelay(myReason, () => {
-    console.info("Request suspend delay will time out.");
+    console.info("Request suspension delay will time out.");
 });
 // 打印延迟挂起信息
 var id = delayInfo.requestId;