Because of a forum limitation, I can not directly the img here, so here's a link to imgur where you can see the full screenshot : https://imgur.com/a/Akqqv3E

In system settings > workspace > shortcuts > global shortcuts > plasma, there is an entry for "edit contents..." and I was curious to know what would that be for ?

Well, that could definitely use a better name in there, but that's for editing the contents of your Clipboard.