Better organized @nx syntax documentation

We mentioned a little about @nx here:
https://doc.qt.io/qt-6/highdpi.html#image-assets
Also a little bit more in detail here:
https://doc.qt.io/qt-6/scalability.html#loading-files-depending-on-platform

But not in some of the actual classes/APIs that @nx is actually used. Yes, it is there for QIcon:
https://doc.qt.io/qt-6/qicon.html#high-dpi-icons
But not in Image:
https://doc.qt.io/qt-6/qml-qtquick-image.html
Or QQuickImageProvider:
https://doc.qt.io/qt-6/qquickimageprovider.html

Customer is looking forward to a more aligned, better organized documentation about @nx syntax.