update README.md.

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@ -48,7 +48,7 @@ base/security/device_security_level
## Constraints
- Only C and C++ are supported.
- The default security level of OpenHarmony devices is SL1. Device vendors can [customize](https://gitee.com/openharmony/docs/blob/master/en/device-dev/subsystems/subsys-security-devicesecuritylevel.md#Customizing Device Security Levels) a higher security level as required.
- The default security level of OpenHarmony devices is SL1. Device vendors can [customize](https://gitee.com/openharmony/docs/blob/master/en/device-dev/subsystems/subsys-security-devicesecuritylevel.md) a higher security level as required.
## Description