Add the blockingmaster/slave to the examples.qdoc
Add the blockingmaster/slave to the examples.qdoc

Apparently, this had been mixed when those examples and their documentations
were merged in.

Change-Id: I94b6a355cc1bee1a910777b7bd8dfd3d40ea09bb
Reviewed-by: Denis Shienkov <6a9c747bd2ba446682324cf340d3b86f30cf4d55@gmail.com>

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