ListPropertyAssignBehavior needs a sample code

link: https://doc.qt.io/qt-6/qtqml-documents-definetypes.html#listpropertyassignbehavior

i think it needs some code snippets of qml to show how exactly "Append" "Replace" and "ReplaceIfNotDefault" work.

currently it is difficult to imagine how it works from the perspective of readers.

QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_APPEND, QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_REPLACE, and QML_LIST_PROPERTY_ASSIGN_BEHAVIOR_REPLACE_IF_NOT_DEFAULT also don't have descriptions on it.