Fix a typo (or copy/paste) error for the comment

It is incorrect English in there, and also incorrect content what it tries to
explain. Also, it is not consistent with the rest like QtNetwork, i.e
QAbstractSocket.

Change-Id: Ibfca1314145e1c49cda7a3e77d9d9ac97d2b6dd2
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Make the return value void for methods that would always return true

Change-Id: Iaa869b8b618db630d46726d7ebeac83e8a826af3
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>