update docs
Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>
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![en/device-dev/driver/figures/4-wire-uart-communication.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/4-wire-uart-communication.png)
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![en/device-dev/driver/figures/4-wire-uart-communication.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/4-wire-uart-communication.png)
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![en/device-dev/driver/figures/using-PWM-process.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/using-PWM-process.png)
![en/device-dev/driver/figures/using-UART-process.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/using-UART-process.png)
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![en/device-dev/driver/figures/using-UART-process.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/using-UART-process.png)
![en/device-dev/driver/figures/using-watchdog-process.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/using-watchdog-process.png)
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![en/device-dev/driver/figures/using-watchdog-process.png](https://gitcode.net/qq_58737190/docs/-/raw/c30d987df576c27a6b5ae3eba94f3b4653e0597c/en/device-dev/driver/figures/using-watchdog-process.png)
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