How to find in documenation the QtQuick versions for a Qt version?

What business processes does one use to find the latest QtQuick version when upgrading to a new version of Qt? For example, I upgraded to Qt5.4 but my existing QML code imports QtQuick 2.3. But I just saw sample QML in this forum that imported QtQuick 2.4. (I looked in the release notes for Qt Quick http://doc.qt.io/qt-5/qtquick-releasenotes.html and it only discusses Qt5.1, i.e. its out of date.) More generally, where is a discussion of backward compatibility for Qt Quick versions? I don’t have any shipping code so that is not really pertinent to me, I just want to use the latest in hopes there are fixes that might help my problems.