drivers/sdcard: Update doc for ESP8266 to use correct SPI number.
machine.SPI(0) results in ValueError on ESP8266.  SPI(1) is the user
hardware SPI port (or use SPI(-1) for software SPI).
@@ -14,7 +14,7 @@ Example usage on pyboard:
Example usage on ESP8266:
import machine, sdcard, os
- sd = sdcard.SDCard(machine.SPI(0), machine.Pin(15))
+ sd = sdcard.SDCard(machine.SPI(1), machine.Pin(15))
os.umount()
os.VfsFat(sd, "")
os.listdir()
