Update api_reference.md

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LiHuashen
2018-12-02 21:47:50 +08:00
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## [LCD](en/api_reference/api_lcd)
## Peripherals
### * [GPIO](en/api_reference/peripherals/api_gpio)
### 1. [GPIO](en/api_reference/peripherals/api_gpio)
## [Speaker](en/api_reference/api_speaker)