docs: add a note to mck_io_num: for esp32, only gpio0/gpio1/gpio3 can be set Closes DOC-2218 See merge request espressif/esp-idf!15812
docs: add a note to mck_io_num: for esp32, only gpio0/gpio1/gpio3 can be set Closes DOC-2218 See merge request espressif/esp-idf!15812