update zh-cn/application-dev/reference/apis/js-apis-data-preferences.md.

Signed-off-by: N@ge-yafang <geyafang@huawei.com>
Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-data-preferences.md

@@ -382,7 +382,7 @@ let promise = preferences.put('startup', 'auto');
 promise.then(() => {
     console.info("Succeeded in putting value of 'startup'.");
 }).catch((err) => {
-    console.info("Failed to put value of 'startup'. Cause: " + err));
+    console.info("Failed to put value of 'startup'. Cause: " + err);
 })
 ```