Split "Module Definition qmldir Files"'s table

https://doc.qt.io/qt-6/qtqml-modules-qmldir.html#contents-of-a-module-definition-qmldir-file has a table listing all entries that can be found in a qmldir file. However, that makes it rather hard to link to a specific entry (for instance in https://doc-snapshots.qt.io/qt6-dev/qt-add-qml-module.html).

Ideally, we would instead either use a (definition?) list or subsections, and would add anchors so that we can link to the individual subsections