[bsp][rtduino] update readme
@@ -38,8 +38,8 @@ This board complies with Arduino UNO pins layout. For more details, please take
| 11 (D11) | PA7 | No | PWM17-CH1. Token over by RT-Thread PWM device by default |
| 12 (D12) | PA6 | No | |
| 13 (D13, LED_BUILTIN) | PA5 | No | USER LED |
-| 14 (D14) | PB9 | Yes | I2C1-SDA. Token over by RT-Thread I2C device by default |
-| 15 (D15) | PB8 | Yes | I2C1-SCL. Token over by RT-Thread I2C device by default |
+| 14 (D14) | PB9 | Yes | I2C-SDA. Token over by RT-Thread I2C device by default |
+| 15 (D15) | PB8 | Yes | I2C-SCL. Token over by RT-Thread I2C device by default |
| 16 (D16) | PC13 | No | USER Button |
| A0 | PA0 | No | ADC1-CH0. Token over by RT-Thread ADC device by default |
| A1 | PA1 | No | ADC1-CH1. Token over by RT-Thread ADC device by default |
