py/bc0.h: Add comment that MP_BC_MAKE_CLOSURE/_DEFARGS take extra byte.
py/bc0.h: Add comment that MP_BC_MAKE_CLOSURE/_DEFARGS take extra byte.

kerneltask/micropython,selste/micropython,trezor/micropython,tobbad/micropython,tobbad/micropython,kerneltask/micropython,trezor/micropython,henriknelson/micropython,pramasoul/micropython,pozetroninc/micropython,henriknelson/micropython,tobbad/micropython,pramasoul/micropython,adafruit/circuitpython,selste/micropython,henriknelson/micropython,bvernoux/micropython,kerneltask/micropython,pozetroninc/micropython,MrSurly/micropython,bvernoux/micropython,bvernoux/micropython,adafruit/circuitpython,trezor/micropython,trezor/micropython,bvernoux/micropython,selste/micropython,adafruit/circuitpython,tobbad/micropython,tobbad/micropython,pozetroninc/micropython,adafruit/circuitpython,pramasoul/micropython,adafruit/circuitpython,selste/micropython,pozetroninc/micropython,MrSurly/micropython,kerneltask/micropython,henriknelson/micropython,MrSurly/micropython,pramasoul/micropython,pramasoul/micropython,henriknelson/micropython,bvernoux/micropython,MrSurly/micropython,pozetroninc/micropython,MrSurly/micropython,kerneltask/micropython,adafruit/circuitpython,trezor/micropython,selste/micropython