Hello,
I’m about to prepare an internal presentation about GeoServer.
Unfortunately I found, that the nice swagger page does not work any more 
https://docs.geoserver.org/latest/en/api/
The internal error message is:
Uncaught TypeError: window.ui.expandAll is not a function
onload https://docs.geoserver.org/latest/en/api/:55
But I don’t see any recent changes here:
geoserver/doc/en/api at main · geoserver/geoserver · GitHub
Dieter.