The Kwin scripting tutorial misses crucial info

At:

• https://develop.kde.org/docs/extend/plasma/kwin/
• https://invent.kde.org/documentation/develop-kde-org/-/edit/master/content/docs/extend/plasma/kwin/_index.md

Missing info:

• https://forum.kde.org/viewtopic.php?f=305&t=163749&p=454755#p454755
• https://askubuntu.com/a/1406027/19033