You probably won't like this answer, but here it is anyway: REST does not use the terminology "endpoint" at all. You can check Fielding's thesis yourself: http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm - open the PDF and search for "endpoint".
Fumanchu's answer is probably the closest you get: "/Users" is a relative path and can be used as the Request-URI in the Request-Line as per the 2616 HTTP spec.
In a web API documentation I would probably call "/Users" an "Endpoint" reference as you do, and "GET /Users" would be an "Operation". Maybe you can get some inspiration here: https://nhs.3scale.net/docs