Remove the namespace doc as the namespace usage was removed
Remove the namespace doc as the namespace usage was removed

This file does not have any useful content either, and unlikely to have in a
foreseeable future.

Change-Id: I36da8a3599f308a42d5809168b0f48dc197df126
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

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