QTypeInfo: document Q_PRIMITIVE_TYPE existing practice

Despite the documentation requiring Q_PRIMITIVE_TYPEs to
be PODs, existing practice in Qt (QFixed, QFlags, QUuid)
is to allow constructors on primitive types as long as
every bit pattern represents a valid object (ie. memory
doesn't have to be initialised to hold an object of the
type) and memcpy() can be used to create an independent
copy of the object (memcpy()ing QString, e.g., while
creating two valid objects, doesn't create independent
copies).

Change-Id: Ia85d48b89f6cc84e69ea76719eab9a858d247ad6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@nokia.com>

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