update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/device-dev/driver/driver-platform-gpio-des.md

@@ -39,7 +39,7 @@ The figure below shows the general GPIO development process. In the APIs, a GPIO
 
 **Figure  1** Using GPIO driver APIs
 
-![](figures/using-gpio-process.png "using-gpio-process.png")
+![](figures/using-GPIO-process.png "using-gpio-process.png")
 
 
 ### Determining the GPIO Pin Number
@@ -70,7 +70,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 - Set the GPIO pin direction.
   Before performing read/write operations on a GPIO pin, call **GpioSetDir()** to set the pin direction.
 
+  ```c
   int32_t GpioSetDir(uint16_t gpio, uint16_t dir);
+  ```
 
     **Table 2** Description of GpioSetDir
   
@@ -86,7 +88,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 
   Call **GpioRead()** to read the level of a GPIO pin.
 
+  ```c
   int32_t GpioRead(uint16_t gpio, uint16_t \*val);
+  ```
 
     **Table 3** Description of GpioRead
   
@@ -100,7 +104,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 
   Call **GpioWrite()** to write the level for a GPIO pin.
 
+  ```c
   int32_t GpioWrite(uint16_t gpio, uint16_t val);
+  ``` 
  
     **Table 4** Description of GpioWrite
   
@@ -144,7 +150,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 
   Call **GpioSetIrq()** to set the ISR function for a GPIO pin.
 
+  ```c
   int32_t GpioSetIrq(uint16_t gpio, uint16_t mode, GpioIrqFunc func, void \*arg);
+  ``` 
  
     **Table 5** Description of GpioSetIrq
   
@@ -163,7 +171,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 
   If the ISR function is no longer required, call **GpioUnsetIrq()** to cancel it.
 
+  ```c
   int32_t GpioUnsetIrq(uint16_t gpio, void \*arg);
+  ``` 
 
     **Table 6** Description of GpioUnsetIrq
   
@@ -177,7 +187,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 
   After the ISR function is set, call **GpioEnableIrq()** to enable interrupts for the GPIO pin.
 
+  ```c
   int32_t GpioEnableIrq(uint16_t gpio);
+  ``` 
 
     **Table 7** Description of GpioEnableIrq
   
@@ -193,7 +205,9 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
 
   You can call **GpioDisableIrq** to disable interrupts for the pin.
 
+  ```c
   int32_t GpioDisableIrq(uint16_t gpio);
+  ``` 
 
     **Table 8** Description of GpioDisableIrq
   
@@ -246,7 +260,7 @@ The method for determining the GPIO pin number varies depending on the GPIO cont
   ```
 
 
-## Example
+## Development Example
 
 The procedure is as follows:
 

en/device-dev/driver/driver-platform-gpio-develop.md

@@ -66,6 +66,7 @@ The GPIO module adaptation involves the following steps:
       > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br/> For details about the callbacks in **GpioMethod**, see [Available APIs](#available_apis).
    
 4. Debug the driver.
+   
    (Optional) For new drivers, verify the basic functions, such as the GPIO status control and response to interrupts.
 
 

en/device-dev/driver/driver-platform-hdmi-develop.md

@@ -316,9 +316,11 @@ The HDMI module adaptation involves the following steps:
     - **Bind** function
     
         **Input parameter**:
+    
         **HdfDeviceObject**, an interface parameter exposed by the driver, contains the .hcs information.
     
         **Return value**:
+    
         HDF_STATUS
     
         The table below describes some status. For more information, see **HDF_STATUS** in the **/drivers/framework/include/utils/hdf_base.h** file.
@@ -333,6 +335,7 @@ The HDMI module adaptation involves the following steps:
         |HDF_FAILURE           |Transmission failed.|
     
         **Function description**:
+    
         Initializes the custom structure object **HdmiAdapterHost** and **HdmiCntlr**, and calls the **HdmiCntlrAdd** function to add the HDMI controller to the core layer.
     
         The **HdmiCntlr**, **HdmiAdapterHost**, and **HdfDeviceObject** assign values with each other so that other functions can be converted successfully.
@@ -377,9 +380,11 @@ The HDMI module adaptation involves the following steps:
     - **Init** function
     
         **Input parameter**:
+    
         **HdfDeviceObject**, an interface parameter exposed by the driver, contains the .hcs information.
     
         **Return value**:
+    
         HDF_STATUS
     
         **Function description**:
@@ -396,12 +401,15 @@ The HDMI module adaptation involves the following steps:
     - **Release** function
     
         **Input parameter**:
+        
        **HdfDeviceObject**, an interface parameter exposed by the driver, contains the .hcs information.
         
         **Return value**:
+        
         No value is returned.
         
         **Function description**:
+        
         Releases the memory and deletes the controller. This function assigns values to the **Release** callback in the driver entry structure. If the HDF fails to call the **Init** function to initialize the driver, the **Release** function can be called to release driver resources.
         
         ```c