fixed 3855381 from https://gitee.com/xuejikan/docs/pulls/15607

update crypto framework doc
Signed-off-by: Nwangyongzhong2 <wangyongzhong2@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-cryptoFramework.md

@@ -2217,6 +2217,8 @@ sign(data : DataBlob) : Promise\<DataBlob>
 | -------------- | ----------- |
 | Promise\<void> | Promise对象 |
 
+**错误码：**
+
 | 错误码ID | 错误信息               |
 | -------- | ---------------------- |
 | 17620001 | memory error.          |