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Changes to Step #13

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[title] Bed Heater
[* icon_note] The Duet is able to power a heated bed up to 18A. This should be well above the requirement for most heated beds.
-[* icon_note] Polarity does not matter.
+[* icon_note] If your heater has an integrated LED, then the polarity will matter as the LED will not light with reverse polarity. Otherwise, a heater's polarity doesn't matter.
[* black] It is recommended to use the included ferrules, by crimping them to the wires before putting the wires in the terminal block.
[* black] Do not tin (add solder to) these wires.
[* black] Be sure not to twist the terminal block while tightening the screws. It can help to hold the terminal block while tightening.
[* black] Check the screws after a few days/weeks of operation to ensure they are still snug.
-[* black] If your heater has an integrated LED, then the polarity will matter as the LED will not light with reverse polarity. Otherwise, a heater's polarity doesn't matter.