Mark the 1.5 stop bits in the documentation as Windows only
Mark the 1.5 stop bits in the documentation as Windows only

Change-Id: I58ee8bf1913c773f345b23bd01d1cc3fefc5f6ac
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>
Reviewed-by: Sergey Belyashov <8871b4c2d635fca691211507eadbac3d0bc2695a@gmail.com>

kobolabs/qtserialport,kobolabs/qtserialport,RoadWorksSoftware/QtSerialPort-OS2,RoadWorksSoftware/QtSerialPort-OS2