修改备份恢复文档中的示例代码错误

Signed-off-by: Nhuaqingsimeng <qiukaiqing@huawei.com>

zh-cn/application-dev/file-management/app-file-backup-extension.md

@@ -73,8 +73,8 @@ BackupExtensionAbility，是[Stage模型](../../application-dev/application-mode
     "data/storage/el2/base/files/",
     "data/storage/el2/base/preferences/",
     "data/storage/el2/base/haps/*/database/",
-    "data/storage/el2/base/haps/*/base/files/",
-    "data/storage/el2/base/haps/*/base/preferences/",
+    "data/storage/el2/base/haps/*/files/",
+    "data/storage/el2/base/haps/*/preferences/",
     ]
 }
 ```

zh-cn/application-dev/reference/apis/js-apis-file-backup.md

@@ -353,7 +353,7 @@ constructor(callbacks: GeneralCallbacks);
 
   ```js
   import fs from '@ohos.file.fs';
-  let generalCallbacks = backup.GeneralCallbacks({
+  let generalCallbacks = ({
     onFileReady: (err, file) => {
       if (err) {
         console.error('onFileReady failed with err: ' + err);
@@ -568,7 +568,7 @@ constructor(callbacks: GeneralCallbacks);
 
   ```js
   import fs from '@ohos.file.fs';
-  let generalCallbacks = backup.GeneralCallbacks({
+  let generalCallbacks = ({
     onFileReady: (err, file) => {
       if (err) {
         console.error('onFileReady failed with err: ' + err);