QModbusClient docs should not talk about HTTP

https://doc.qt.io/qt-6/qmodbusclient.html#details says, "QModbusClient queues the requests it receives. The number of requests executed in parallel is dependent on the protocol. For example, the HTTP protocol on desktop platforms issues 6 requests in parallel for one host/port combination."

This gives the impression that it is possible to perform HTTP communications with QModbusClient, which is not the case.