Add xrefs to the {f,net,sock}stat.1 manpages. While I'm in there, fix

the sockstat.1 document title, which still remembers when sockstat was
called lsock.

Reviewed by:	mpp

usr.bin/fstat/fstat.1

@@ -209,7 +209,10 @@ of time.
 .Xr netstat 1 ,
 .Xr nfsstat 1 ,
 .Xr ps 1 ,
+.Xr sockstat 1 ,
 .Xr systat 1 ,
+.Xr tcp 4 ,
+.Xr unix 4 ,
 .Xr iostat 8 ,
 .Xr pstat 8 ,
 .Xr vmstat 8

usr.bin/netstat/netstat.1

@@ -284,8 +284,12 @@ Information for a specific interface may be displayed with the
 .Fl I
 option.
 .Sh SEE ALSO
+.Xr fstat 1 ,
 .Xr nfsstat 1 ,
+.Xr sockstat 1 ,
 .Xr ps 1 ,
+.Xr inet 4 ,
+.Xr unix 4 ,
 .Xr hosts 5 ,
 .Xr networks 5 ,
 .Xr protocols 5 ,

usr.bin/sockstat/sockstat.1

@@ -28,7 +28,7 @@
 .\" $FreeBSD$
 .\"
 .Dd April 13, 1999
-.Dt LSOCK 1
+.Dt SOCKSTAT 1
 .Sh NAME
 .Nm sockstat
 .Nd list open Internet sockets