update docs

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

en/application-dev/reference/apis/js-apis-audio.md

@@ -3058,7 +3058,6 @@ Reads the buffer from the audio capturer. This API uses an asynchronous callback
 audioCapturer.read(bufferSize, true, async(err, buffer) => {
     if (!err) {
         console.log("Success in reading the buffer data");
-        var number = fileio.writeSync(fd, buffer);
     }
 };
 ```

en/application-dev/reference/apis/js-apis-bluetooth.md

@@ -1311,7 +1311,7 @@ Disconnects an A2DP connection.
 
 ```js
 let a2dpSrc = bluetooth.getProfile(PROFILE_A2DP_SOURCE);
-let boolean ret = a2dpSrc.disconnect('XX:XX:XX:XX:XX:XX');
+let ret = a2dpSrc.disconnect('XX:XX:XX:XX:XX:XX');
 ```
 
 

en/application-dev/reference/apis/js-apis-socket.md

@@ -563,7 +563,7 @@ Enables listening for error events of the UDPSocket connection. This API uses an
 **Example**
 
 ```
-let udp = socket.constructUDPSocketInstance()
+let udp = socket.constructUDPSocketInstance();
 udp.on('error', err => {
 	console.log("on error, err:" + JSON.stringify(err))
 });
@@ -591,7 +591,7 @@ Disables listening for error events of the UDPSocket connection. This API uses a
 **Example**
 
 ```
-let udp = socket.constructUDPSocketInstance()
+let udp = socket.constructUDPSocketInstance();
 let callback = err =>{
 	console.log("on error, err:" + JSON.stringify(err));
 }