fixed 799b559e from https://gitee.com/wu-chengwen/docs/pulls/3467

fix(usb):add language type
Signed-off-by: Nwu-chengwen <wuchengwen4@huawei.com>

en/application-dev/device/usb-guidelines.md

@@ -93,7 +93,7 @@ You can set a USB device as a host to connect to a device for data transfer. The
 
 1.  Obtain the USB device list.
 
-    ```
+    ```js
     // Import the USB API package.
     import usb from '@ohos.usb';
     // Obtain the USB device list.
@@ -153,7 +153,7 @@ You can set a USB device as a host to connect to a device for data transfer. The
 
 2.  Obtain the device operation permissions.
 
-    ```
+    ```js
     var deviceName = deviceList[0].name;
     // Request the permissions to operate a specified device.
     usb.requestRight(deviceName).then(hasRight => {
@@ -165,7 +165,7 @@ You can set a USB device as a host to connect to a device for data transfer. The
 
 3.  Open the device.
 
-    ```
+    ```js
     // Open the device, and obtain the USB device pipe for data transfer.
     var pipe = usb.connectDevice(deviceList[0]);
     /*
@@ -177,7 +177,7 @@ You can set a USB device as a host to connect to a device for data transfer. The
 
 4.  Perform data transfer.
 
-    ```
+    ```js
     /*
     Read data. Select the corresponding RX endpoint from deviceList for data transfer.
     (endpoint.direction == 0x80); dataUint8Array indicates the data to read. The data type is Uint8Array.
@@ -208,7 +208,7 @@ You can set a USB device as a host to connect to a device for data transfer. The
 
 5.  Release the USB interface, and close the USB device.
 
-    ```
+    ```js
     usb.releaseInterface(pipe, interface);
     usb.closePipe(pipe);
     ```

en/device-dev/subsystems/subsys-usbservice-demo.md

 # USB Usage Demo<a name="EN-US_TOPIC_0000001092792986"></a>
 
 
-```
+```cpp
 #include <cstdio>
 #include <iostream>
 #include <map>

en/device-dev/subsystems/subsys-usbservice-guide.md

@@ -7,40 +7,40 @@ The following procedure uses bulk transfer as an example.
 
 1.  Obtain a USB service instance.
 
-```
+```cpp
 static OHOS::USB::UsbSrvClient &g_usbClient = OHOS::USB::UsbSrvClient::GetInstance();
 ```
 
 2.  Obtain the USB device list.
 
-```
+```cpp
 std::vector<OHOS::USB::UsbDevice> deviceList;
 int32_t ret = g_usbClient.GetDevices(deviceList);
 ```
 
 3.  Apply for device access permissions.
 
-```
+```cpp
 int32_t ret = g_usbClient.RequestRight(device.GetName());
 ```
 
 4.  Open the USB device.
 
-```
+```cpp
 USBDevicePipe pip;
 int32_t et = g_usbClient.OpenDevice(device, pip);
 ```
 
 5.  Configure the USB interface.
 
-```
+```cpp
 ret = g_usbClient.ClaimInterface(pip, interface, true);
 **interface** indicates an interface of the USB device in **deviceList**.
 ```
 
 6.  Transfer data.
 
-```
+```cpp
 srvClient.BulkTransfer(pipe, endpoint, vdata, timeout);
 ```
 - **pipe** indicates the pipe for data transfer of the USB device opened. 
@@ -50,6 +50,6 @@ srvClient.BulkTransfer(pipe, endpoint, vdata, timeout);
 
 7.  Close the USB device.
 
-```
+```cpp
 ret = g_usbClient.Close(pip);
 ```

zh-cn/application-dev/device/usb-guidelines.md

@@ -38,7 +38,7 @@ USB设备可作为Host设备连接Device设备进行数据传输。开发示例
 
 
 1. 获取设备列表。
-   ```
+   ```js
    // 导入usb接口api包。
    import usb from '@ohos.usb';
    // 获取设备列表。
@@ -97,7 +97,7 @@ USB设备可作为Host设备连接Device设备进行数据传输。开发示例
    ```
 
 2. 获取设备操作权限。
-   ```
+   ```js
    var deviceName = deviceList[0].name;
    // 申请操作指定的device的操作权限。
    usb.requestRight(deviceName).then(hasRight => {
@@ -108,7 +108,7 @@ USB设备可作为Host设备连接Device设备进行数据传输。开发示例
    ```
 
 3. 打开Device设备。
-   ```
+   ```js
    // 打开设备，获取数据传输通道。
    var pipe = usb.connectDevice(deviceList[0]);
    /*
@@ -119,7 +119,7 @@ USB设备可作为Host设备连接Device设备进行数据传输。开发示例
    ```
 
 4. 数据传输。
-   ```
+   ```js
    /*
     读取数据，在device信息中选取对应数据接收的endpoint来做数据传输
    （endpoint.direction == 0x80）；dataUint8Array是要读取的数据，类型为Uint8Array。
@@ -149,7 +149,7 @@ USB设备可作为Host设备连接Device设备进行数据传输。开发示例
    ```
 
 5. 释放接口，关闭设备。
-   ```
+   ```js
    usb.releaseInterface(pipe, interface1);
    usb.closePipe(pipe);
    ```

zh-cn/device-dev/subsystems/subsys-usbservice-demo.md

 # USB服务子系使用实例<a name="ZH-CN_TOPIC_0000001092792986"></a>
 
 
-```
+```cpp
 #include <cstdio>
 #include <iostream>
 #include <map>

zh-cn/device-dev/subsystems/subsys-usbservice-guide.md

@@ -8,46 +8,46 @@
 
 1.  获取usb service实例
 
-```
+```cpp
 static OHOS::USB::UsbSrvClient &g_usbClient = OHOS::USB::UsbSrvClient::GetInstance();
 ```
 
 2.  获取usb设备列表
 
-```
+```cpp
 std::vector<OHOS::USB::UsbDevice> deviceList;
 int32_t ret = g_usbClient.GetDevices(deviceList);
 ```
 
 3.  申请设备权限
 
-```
+```cpp
 int32_t ret = g_usbClient.RequestRight(device.GetName());
 ```
 
 4.  打开设备
 
-```
+```cpp
 USBDevicePipe pip;
 int32_t et = g_usbClient.OpenDevice(device, pip);
 ```
 
 5.  配置设备接口
 
-```
+```cpp
 ret = g_usbClient.ClaimInterface(pip, interface, true);
 interface为deviceList中device的interface。
 ```
 
 6.  数据传输
 
-```
+```cpp
 srvClient.BulkTransfer(pipe, endpoint, vdata, timeout);
 ```
 pipe为打开设备后的数据传输通道，endpoint为device中数据传输的端点，vdata是需要传输或读取的二进制数据块，timeout为传输超时时长.
 
 7.  关闭设备
 
-```
+```cpp
 ret = g_usbClient.Close(pip);
 ```