Doc: minor changes to index.qdoc
Doc: minor changes to index.qdoc

index.qdoc of QtSerialPort

Task-number: QTBUG-32173
Change-Id: I0cc4a3fd0b469d344da952dfd1042e431e043a4b
Reviewed-by: Laszlo Papp <2164cc32668ec579454611fc5261234262c80421@kde.org>
Reviewed-by: Martin Smith <a8cc6484db2755056ccf1c457da8ca771f895dea@digia.com>

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