ip: update mand pages and usage() for 'ip mroute'

Sync with the current code.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

ip/ipmroute.c

@@ -36,6 +36,8 @@ static void usage(void) __attribute__((noreturn));
 static void usage(void)
 {
 	fprintf(stderr, "Usage: ip mroute show [ PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
+	fprintf(stderr, "                      [ table TABLE_ID ]\n");
+	fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
 #if 0
 	fprintf(stderr, "Usage: ip mroute [ add | del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
 #endif

man/man8/ip-mroute.8

-.TH IP\-MROUTE 8 "20 Dec 2011" "iproute2" "Linux"
+.TH IP\-MROUTE 8 "13 Dec 2012" "iproute2" "Linux"
 .SH "NAME"
 ip-mroute \- multicast routing cache management
 .SH "SYNOPSIS"
@@ -6,12 +6,15 @@ ip-mroute \- multicast routing cache management
 .ad l
 .in +8
 .ti -8
-.BR "ip mroute show" " ["
+.BR "ip " " [ ip-OPTIONS ] " "mroute show" " [ [ "
+.BR " to " " ] "
 .IR PREFIX " ] [ "
 .B  from
 .IR PREFIX " ] [ "
 .B  iif
-.IR DEVICE " ]"
+.IR DEVICE " ] [ "
+.B table
+.IR TABLE_ID " ] "
 
 .SH DESCRIPTION
 .B mroute
@@ -42,6 +45,11 @@ the interface on which multicast packets are received.
 .BI from " PREFIX"
 the prefix selecting the IP source addresses of the multicast route.
 
+.TP
+.BI table " TABLE_ID"
+the table id selecting the multicast table. It can be
+.BR local ", " main ", " default ", " all " or a number."
+
 .SH SEE ALSO
 .br
 .BR ip (8)