!19733 file.fs lock相关示例代码问题修复

Merge pull request !19733 from zhuhongtao666/630

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

@@ -3187,7 +3187,7 @@ lock(exclusive?: boolean): Promise\<void>
 **示例：**
 
   ```js
-  let file = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
+  let file = fs.openSync(pathDir + "/test.txt", fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
   file.lock(true).then(() => {
     console.log("lock file successful");
   }).catch((err) => {
@@ -3217,7 +3217,7 @@ lock(exclusive?: boolean, callback: AsyncCallback\<void>): void
 **示例：**
 
   ```js
-  let file = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
+  let file = fs.openSync(pathDir + "/test.txt", fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
   file.lock(true, (err) => {
     if (err) {
       console.info("lock file failed with error message: " + err.message + ", error code: " + err.code);
@@ -3248,7 +3248,7 @@ tryLock(exclusive?: boolean): void
 **示例：**
 
   ```js
-  let file = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
+  let file = fs.openSync(pathDir + "/test.txt", fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
   file.tryLock(true);
   console.log("lock file successful");
   ```
@@ -3268,7 +3268,7 @@ unlock(): void
 **示例：**
 
   ```js
-  let file = fs.openSync(path, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
+  let file = fs.openSync(pathDir + "/test.txt", fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
   file.tryLock(true);
   file.unlock();
   console.log("unlock file successful");