When you right click an object in the explorer menu you get this dropdown menu. Clicking the help button brings up this devhub article on attachments and constraints, regardless of what object you clicked on. It could be a part, service, folder, etc.
I’m not actually sure if it’s supposed to take you to the API reference for the object you clicked on (that would actually be fairly useful), but as far as I can tell it always takes you to that article on constraints.