[RTduino][stm32f469-disco][readme] fix typo
@@ -23,7 +23,7 @@ Hardware Drivers Config --->
This board complies with Arduino UNO pins layout. For more details, please take a look at: [pins_arduino.c](pins_arduino.c) and [pins_arduino.h](pins_arduino.h).
| Arduino Pin | STM32 Pin | 5V Tolerate | Note |
-| ----------- | --------- | ----------- | --------------------------------------------------------------------------------------------- |
+| --------------------- | --------- | ----------- | --------------------------------------------------------------------------------------------- |
| 0 (D0) | PG9 | Yes | Serial-Rx. Token over by RT-Thread UART device by default |
| 1 (D1) | PG14 | Yes | Serial-Tx. Token over by RT-Thread UART device by default |
| 2 (D2) | PG13 | Yes | |
@@ -37,7 +37,7 @@ This board complies with Arduino UNO pins layout. For more details, please take
| 10 (D10) | PH6 | Yes | PWM12-CH1. Token over by RT-Thread PWM device by default |
| 11 (D11) | PB15 | Yes | PWM12-CH2. Token over by RT-Thread PWM device by default |
| 12 (D12) | PB14 | Yes | |
-| 13 (D13, ) | PD3 | Yes | USER LED1 |
+| 13 (D13, LED_BUILTIN) | PD3 | Yes | USER LED1 |
| 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) | PA0 | Yes | USER Button |
