Argument consistency.

Use "<args> ..." in the usage message to indicate that the arguments are
not the literal string "args" and that there can be an arbitrary number
of them.

The Italian message was already like this but the English and French
were not.

messages.mc

@@ -11,7 +11,7 @@
 Language = English
 NSSM: The non-sucking service manager
 Version %s %s, %s
-Usage: nssm <option> [args]
+Usage: nssm <option> [<args> ...]
 
 To show service installation GUI:
 
@@ -19,7 +19,7 @@
 
 To install a service without confirmation:
 
-        nssm install <servicename> <app> [<args>]
+        nssm install <servicename> <app> [<args> ...]
 
 To show service editing GUI:
 
@@ -56,7 +56,7 @@
 Language = French
 NSSM: Le gestionnaire de services Windows pour les professionnels!
 Version %s %s, %s
-Syntaxe: nssm <option> [arguments]
+Syntaxe: nssm <option> [<arguments> ...]
 
 Pour afficher l'écran d'installation du service:
 
@@ -64,7 +64,7 @@
 
 Pour installer un service sans confirmation:
 
-        nssm install <nom_du_service> <application> [<arguments>]
+        nssm install <nom_du_service> <application> [<arguments> ...]
 
 Pour afficher l'écran d'édition du service: