docs/esp32: Fix machine.Timer quickref to specify HW timers.
docs/esp32: Fix machine.Timer quickref to specify HW timers.

Also remove trailing spaces on other lines.

pramasoul/micropython,bvernoux/micropython,adafruit/circuitpython,henriknelson/micropython,pramasoul/micropython,adafruit/circuitpython,MrSurly/micropython,kerneltask/micropython,henriknelson/micropython,selste/micropython,bvernoux/micropython,kerneltask/micropython,selste/micropython,pramasoul/micropython,adafruit/circuitpython,kerneltask/micropython,pramasoul/micropython,selste/micropython,bvernoux/micropython,adafruit/circuitpython,MrSurly/micropython,MrSurly/micropython,adafruit/circuitpython,selste/micropython,MrSurly/micropython,bvernoux/micropython,kerneltask/micropython,selste/micropython,kerneltask/micropython,bvernoux/micropython,pramasoul/micropython,henriknelson/micropython,MrSurly/micropython,henriknelson/micropython,adafruit/circuitpython,henriknelson/micropython