updated docs

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

en/device-dev/kernel/kernel-standard.md

-# Kernel for the Standard System<a name="EN-US_TOPIC_0000001111199444"></a>
+# Kernel for Standard Systems<a name="EN-US_TOPIC_0000001111199444"></a>
 
 -   **[Linux Kernel Overview](kernel-standard-overview.md)**  
 

en/readme.md

@@ -15,7 +15,7 @@ This project stores OpenHarmony documentation, including the quick start guide,
           - **Kernel：**[Kernel for Small Systems](device-dev/kernel/kernel-small.md)
           - **Drivers**:  [Drivers](device-dev/driver/Readme-EN.md)
           - **Subsystems**:  [Subsystems](device-dev/subsystems/Readme-EN.md)  \(such as compilation and building, graphics, DFX, and XTS\)
-          - **Security**:  [Privacy and Security](device-dev/security/Readme-EN.md)
+          - **Security**:  [Privacy and security](device-dev/security/Readme-EN.md)
         - **guide**:  
           - [WLAN-connected Products](device-dev/guide/device-wlan.md)  \(LED peripheral control and third-party SDK integration\)
           - [Screenless Cameras](device-dev/guide/device-iotcamera-control.md)  \(camera control\)