docs/ure: Document sub(), groups(), span(), start() and end().
docs/ure: Document sub(), groups(), span(), start() and end().

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