bug#6725: say what clients

[jidanni]

Upon trying to exit emacs, the users might see:
     This Emacs session has clients; exit anyway? (yes or no)
OK, but the user thinks "why clients is he talking about? Can I see a
list please?"

(However looking at the following, it doesn't really help either:)
server-clients is a variable defined in `server.el'.
Its value is
(#<process server <2>>)

Documentation:
List of current server clients.
Each element is a process.

emacs-version "24.0.50.1"