docs/esp32: Add SDCard to quickref.
docs/esp32: Add SDCard to quickref.

bvernoux/micropython,adafruit/circuitpython,adafruit/circuitpython,henriknelson/micropython,bvernoux/micropython,henriknelson/micropython,bvernoux/micropython,henriknelson/micropython,bvernoux/micropython,henriknelson/micropython,henriknelson/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython