[UoM] Added millibar unit to the Docs (#6671)
[UoM] Added millibar unit to the Docs (#6671)

Also-by: Vincent Regaud <0f5f4a89129095712ffcaf65e835629878ae5ab9@gmail.com>
Signed-off-by: Kai Kreuzer <31ea678c44dc4e8e22ccfd165592dd71a30e46ae@openhab.org>
Snickermicker/smarthome,Snickermicker/smarthome,Snickermicker/smarthome,Snickermicker/smarthome