feat: Update GPIO count and ADC inputs in quickstart documentation

Adjusted the number of available multi-function General Purpose I/Os (GPIOs) from 21 to 20 and updated the ADC inputs from 7 to 6 for accuracy.

Signed-off-by: ChihoSin chihosin@icloud.com

Author: chihosin

docs/product/f1101/quickstart.mdx

@@ -67,7 +67,7 @@ By reading the voltage at the measurement point with the ADC, the battery voltag
 
 ## General purpose I/Os
 
-There are up to 21 multi-function General Purpose I/Os (GPIOs) available on the header pins, 7 of which can be used as ADC inputs. These GPIOs operate at a 3.3V logic level. Any GPIO can be mapped to a digital peripheral (such as UART, SPI, TWI, PDM, I2S, QSPI, PWM, and QDEC) for layout flexibility.
+There are up to 20 multi-function General Purpose I/Os (GPIOs) available on the header pins, 6 of which can be used as ADC inputs. These GPIOs operate at a 3.3V logic level. Any GPIO can be mapped to a digital peripheral (such as UART, SPI, TWI, PDM, I2S, QSPI, PWM, and QDEC) for layout flexibility.
 
 The MFP provides an additional 4 GPIO pins. Two of these can be connected to an NFC antenna, used with modules supporting the MFP interface, or configured as two I2C channels.