update docs

Signed-off-by: Nshawn_he <shawn.he@huawei.com>

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

@@ -5,7 +5,7 @@
 
 ## Modules to Import
 
-```
+```js
 import usb from "@ohos.usb";
 ```
 
@@ -17,13 +17,13 @@ Obtains the USB device list.
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | Array<Readonly<[USBDevice](#usbdevice)>> | Device information list.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let devicesList = usb.getDevices();
   console.log(`devicesList = ${JSON.stringify(devicesList)}`);
   // devicesList is a list of USB devices.
@@ -89,18 +89,18 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | device | [USBDevice](#usbdevice) | Yes| USB device information.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | Readonly<[USBDevicePipe](#usbdevicepipe)> | USB device pipe for data transfer.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let devicepipe= usb.connectDevice(device);
   console.log(`devicepipe = ${JSON.stringify(devicepipe)}`);
   ```
@@ -114,18 +114,18 @@ Checks whether the application has the permission to access the device.
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | deviceName | string | Yes| Device name.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | boolean | Returns **true** if the application has the permission to access the device; returns **false** otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let divicesName="1-1";
   let bool = usb.hasRight(divicesName);
   console.log(bool);
@@ -140,18 +140,18 @@ Requests the temporary permission for the application to access the USB device.
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | deviceName | string | Yes| Device name.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | Promise<boolean> | Returns **true** if the temporary device access permissions are granted; returns **false** otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let divicesName="1-1";
   usb.requestRight(divicesName).then((ret) => {
     console.log(`requestRight = ${JSON.stringify(ret)}`);
@@ -169,20 +169,20 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
   | iface | [USBInterface](#usbinterface) | Yes| USB interface, which is used to determine the index of the interface to claim.|
   | force | boolean | No| Whether to forcibly claim the USB interface. The default value is **false**, indicating not to forcibly claim the USB interface.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | number | Returns **0** if the USB interface is successfully claimed; returns an error code otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.claimInterface(devicepipe, interfaces);
   console.log(`claimInterface = ${ret}`);
   ```
@@ -198,19 +198,19 @@ Before you do this, ensure that you have claimed the interface by calling [usb.c
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
   | iface | [USBInterface](#usbinterface) | Yes| USB interface, which is used to determine the index of the interface to release.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | number | Returns **0** if the USB interface is successfully released; returns an error code otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.releaseInterface(devicepipe, interfaces);
   console.log(`releaseInterface = ${ret}`);
   ```
@@ -226,19 +226,19 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
   | config | [USBConfig](#usbconfig) | Yes| USB configuration to set.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | number | Returns **0** if the USB configuration is successfully set; returns an error code otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.setConfiguration(devicepipe, config);
   console.log(`setConfiguration = ${ret}`);
   ```
@@ -254,19 +254,19 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
   | iface | [USBInterface](#usbinterface) | Yes| USB interface to set.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | number | Returns **0** if the USB interface is successfully set; returns an error code otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.setInterface(devicepipe, interfaces);
   console.log(`setInterface = ${ret}`);
   ```
@@ -282,18 +282,18 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | Uint8Array | Raw descriptor data.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.getRawDescriptor(devicepipe);
   ```
 
@@ -308,18 +308,18 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | number | File descriptor of the USB device.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.getFileDescriptor(devicepipe);
   ```
 
@@ -334,20 +334,20 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
   | contrlparam | [USBControlParams](#usbcontrolparams) | Yes| Control transfer parameters.|
   | timeout | number | No| Timeout duration. The default value is **0**, indicating no timeout.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | Promise<number> | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs.|
 
-- Example
-  ```
+- **Example**
+  ```js
   usb.controlTransfer(devicepipe, USBControlParams).then((ret) => {
    console.log(`controlTransfer = ${JSON.stringify(ret)}`);
   })
@@ -364,7 +364,7 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
@@ -372,13 +372,13 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
   | buffer | Uint8Array | Yes| Buffer for writing or reading data.|
   | timeout | number | No| Timeout duration. The default value is **0**, indicating no timeout.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | Promise<number> | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs.|
 
-- Example
-  ```
+- **Example**
+  ```js
   // Call usb.getDevices to obtain a data set. Then, obtain a USB device and its access permission.
   // Pass the obtained USB device as a parameter to usb.connectDevice. Then, call usb.connectDevice to connect the USB device.
   // Call usb.claimInterface to claim the USB interface. After that, call usb.bulkTransfer to start bulk transfer.
@@ -398,18 +398,18 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
 
 **System capability**: SystemCapability.USB.USBManager
 
-- Parameters
+- **Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
   | pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe.|
 
-- Return value
+- **Return value**
   | Type| Description|
   | -------- | -------- |
   | number | Returns **0** if the USB device pipe is closed successfully; returns an error code otherwise.|
 
-- Example
-  ```
+- **Example**
+  ```js
   let ret = usb.closePipe(devicepipe);
   console.log(`closePipe = ${ret}`);
   ```