[dmx] fix documentation typo (#5686)
[dmx] fix documentation typo (#5686)


Snickermicker/openhab2,theoweiss/openhab2,theoweiss/openhab2,Snickermicker/openhab2,theoweiss/openhab2,Snickermicker/openhab2,Snickermicker/openhab2,theoweiss/openhab2