ip: update man pages and usage() for 'ip monitor'

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

ip/ipmonitor.c

@@ -29,7 +29,10 @@ int prefix_banner;
 
 static void usage(void)
 {
-	fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ]\n");
+	fprintf(stderr, "Usage: ip monitor [ all | LISTofOBJECTS ] [ FILE ]\n");
+	fprintf(stderr, "LISTofOBJECTS := link | address | route | mroute | prefix |\n");
+	fprintf(stderr, "                 neigh | netconf\n");
+	fprintf(stderr, "FILE := file FILENAME\n");
 	exit(-1);
 }
 

man/man8/ip-monitor.8

-.TH IP\-MONITOR 8 "20 Dec 2011" "iproute2" "Linux"
+.TH IP\-MONITOR 8 "13 Dec 2012" "iproute2" "Linux"
 .SH "NAME"
 ip-monitor, rtmon \- state monitoring
 .SH "SYNOPSIS"
@@ -6,8 +6,8 @@ ip-monitor, rtmon \- state monitoring
 .ad l
 .in +8
 .ti -8
-.BR "ip monitor" " [ " all " |"
-.IR LISTofOBJECTS " ]"
+.BR "ip " " [ ip-OPTIONS ] " "monitor" " [ " all " |"
+.IR LISTofOBJECTS " ] [ file " FILENAME " ]
 .sp
 
 .SH DESCRIPTION
@@ -20,12 +20,13 @@ Namely, the
 command is the first in the command line and then the object list follows:
 
 .BR "ip monitor" " [ " all " |"
-.IR LISTofOBJECTS " ]"
+.IR LISTofOBJECTS " ] [ file " FILENAME " ]
 
 .I OBJECT-LIST
 is the list of object types that we want to monitor.
 It may contain
-.BR link ", " address " and " route "."
+.BR link ", " address ", " route ", " mroute ", " prefix ", "
+.BR neigh " and " netconf "."
 If no
 .B file
 argument is given,
@@ -34,7 +35,9 @@ opens RTNETLINK, listens on it and dumps state changes in the format
 described in previous sections.
 
 .P
-If a file name is given, it does not listen on RTNETLINK,
+If a
+.I FILENAME
+is given, it does not listen on RTNETLINK,
 but opens the file containing RTNETLINK messages saved in binary format
 and dumps them.  Such a history file can be generated with the
 .B rtmon