Missing documentation for QQuick3DGeometry::Attribute (and QQuick3DGeometry::TargetAttribute)

https://doc.qt.io/qt-6/qquick3dgeometry.html#addAttribute and https://doc.qt.io/qt-6/qquick3dgeometry.html#attribute deals with Attribute objects, but this class (struct) is not documented.

Ditto for https://doc.qt.io/qt-6/qquick3dgeometry.html#addTargetAttribute-1 and https://doc.qt.io/qt-6/qquick3dgeometry.html#targetAttribute which deal with TargetAttribute objects.