update docs against 8800

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

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

-# Sensor Usage Example<a name="EN-US_TOPIC_0000001092792985"></a>
+# Sensor Usage Example
 
-The following sample code uses the sensor whose  **sensorTypeId**  is  **0**  as an example. The code for other sensor types is similar.
+The following sample code uses the sensor whose **sensorTypeId** is **0** as an example. The code for other sensor types is similar.
 
-```
+```c
 #include "sensor_agent.h"
 #include "sensor_agent_type.h"
 #include "stdio.h"

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

-# Sensor Usage Guidelines<a name="EN-US_TOPIC_0000001077367158"></a>
+# Sensor Usage Guidelines
 
-The following steps use the sensor whose  **sensorTypeId**  is  **0**  as an example. The guidelines for other sensor types are similar.
+The following steps use the sensor whose **sensorTypeId** is **0** as an example. The guidelines for other sensor types are similar.
 
-## How to Use<a name="section18816105182315"></a>
+## How to Use
 
 1.  Import the required header files.
 
-```
-#include "sensor_agent.h"
-#include "sensor_agent_type.h"
-```
 
-1.  Create a sensor callback.
+    ```c
+    #include "sensor_agent.h"
+    #include "sensor_agent_type.h"
+    ```
 
-```
-void SensorDataCallbackImpl(SensorEvent *event)
-{
-    if(event == NULL){
-        return;
-    }
-    float *sensorData=(float *)event->data;
-}
-```
-
->![](../public_sys-resources/icon-note.gif) **NOTE:** 
->The callback must be of the RecordSensorCallback type.
+2. Create a sensor callback.
 
-1.  Obtain the list of sensors supported by the device.
-
-```
-SensorInfo *sensorInfo = (SensorInfo *)NULL;
-int32_t count = 0;
-int32_t ret = GetAllSensors(&sensorInfo, &count);
-```
+    ```c
+    void SensorDataCallbackImpl(SensorEvent *event)
+    {
+        if(event == NULL){
+            return;
+        }
+        float *sensorData=(float *)event->data;
+    }
+    ```
+    
+    > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
+    > The callback must be of the RecordSensorCallback type.
 
-1.  Create a sensor user.
+3. Obtain the list of sensors supported by the device.
 
-```
-SensorUser sensorUser;
-sensorUser.callback = SensorDataCallbackImpl; // Assign the created callback SensorDataCallbackImpl to the member variable callback.
-```
+    ```c
+    SensorInfo *sensorInfo = (SensorInfo *)NULL;
+    int32_t count = 0;
+    int32_t ret = GetAllSensors(&sensorInfo, &count);
+    ```
 
-1.  Enable the sensor.
+4. Create a sensor user.   
 
-```
-int32_t ret = ActivateSensor(0, &sensorUser);
-```
+    ```c
+    SensorUser sensorUser;
+    sensorUser.callback = SensorDataCallbackImpl; // Assign the created callback SensorDataCallbackImpl to the member variable callback.
+    ```
 
-1.  Subscribe to sensor data.
+5. Enable the sensor.    
 
-```
-int32_t ret = SubscribeSensor(0, &sensorUser);
-```
+    ```c
+    int32_t ret = ActivateSensor(0, &sensorUser);
+    ```
 
->![](../public_sys-resources/icon-note.gif) **NOTE:** 
->Till now, you can obtain the sensor data via the callback.
+6. Subscribe to sensor data.
 
-1.  Unsubscribe from the sensor data.
+    ```c
+    int32_t ret = SubscribeSensor(0, &sensorUser);
+    ```
+    
+    > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
+    > Till now, you can obtain the sensor data via the callback.
 
-```
-int32_t ret = UnsubscribeSensor(0, &sensorUser);
-```
+7. Unsubscribe from the sensor data.
 
-1.  Disable the sensor.
+    ```c
+    int32_t ret = UnsubscribeSensor(0, &sensorUser);
+    ```
 
-```
-int32_t ret = DeactivateSensor(0, &sensorUser);
-```
+8. Disable the sensor.
 
+    ```c
+    int32_t ret = DeactivateSensor(0, &sensorUser);
+    ```