man: ip-ntable.8: Review synopsis section

The first line contained a c'n'p error, incorrectly listing 'ip address'
syntax. Since PARAMS is used just once and there are not many other
parameters to 'ip ntable change', state them inline and in addition to
that clarify the possibility to pass multiple parameters at once.
Signed-off-by: Phil Sutter <phil@nwl.cc>

man/man8/ip-ntable.8

@@ -8,7 +8,7 @@ ip-ntable - neighbour table configuration
 .ti -8
 .B ip
 .RI "[ " OPTIONS " ]"
-.B address
+.B ntable
 .RI " { " COMMAND " | "
 .BR help " }"
 .sp
@@ -17,34 +17,39 @@ ip-ntable - neighbour table configuration
 .BR "ip ntable change name"
 .IR NAME " [ "
 .B dev
-.IR DEV " ] " PARMS
-
-.ti -8
-.IR PARMS " := { "
+.IR DEV " ] ["
 .B thresh1
-.IR VAL " | "
+.IR VAL " ] ["
 .B thresh2
-.IR VAL " | "
+.IR VAL " ] ["
 .B thresh3
-.IR VAL " | "
+.IR VAL " ] ["
 .B gc_int
-.IR MSEC " | "
+.IR MSEC " ] ["
 .B base_reachable
-.IR MSEC " | "
+.IR MSEC " ] ["
 .B retrans
-.IR MSEC " | " "gc_stale MSEC " " | "
+.IR MSEC " ] ["
+.B gc_stale
+.IR MSEC " ] ["
 .B delay_probe
-.IR MSEC " | " "queue LEN " " | "
+.IR MSEC " ] ["
+.B queue
+.IR LEN " ] ["
 .B app_probs
-.IR VAL " | "
+.IR VAL " ] ["
 .B ucast_probes
-.IR VAL " | " "mcast_probes VAL " " | "
+.IR VAL " ] ["
+.B mcast_probes
+.IR VAL " ] ["
 .B anycast_delay
-.IR MSEC " | "
+.IR MSEC " ] ["
 .B proxy_delay
-.IR MSEC " | " "proxy_queue LEN " " | "
+.IR MSEC " ] ["
+.B proxy_queue
+.IR LEN " ] ["
 .B locktime
-.IR MSEC " }"
+.IR MSEC " ]"
 
 .ti -8
 .BR "ip ntable show" " [ "