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

Signed-off-by: Nduangavin123 <duanxichao@huawei.com>

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

 # Sensors<a name="EN-US_TOPIC_0000001111039534"></a>
 
--   **[Sensors Overview](subsys-densor-overview.md)**  
+-   **[Sensors Overview](subsys-sensor-overview.md)**  
 
--   **[Sensors Usage Guidelines](subsys-densor-guide.md)**  
+-   **[Sensors Usage Guidelines](subsys-sensor-guide.md)**  
 
--   **[Sensors Usage Example](subsys-densor-demo.md)**  
+-   **[Sensors Usage Example](subsys-sensor-demo.md)**