stub(8): remove reference to sshnet

sys/man/8/stub

@@ -25,28 +25,6 @@ print all 9P messages
 make
 .I name
 a directory; by default it is a file
-.PD
-.SH EXAMPLE
-Use
-.I stub
-and
-.I sshnet
-(see
-.IR ssh (1))
-to create a new network protocol
-.RB `` mit ''
-that is actually TCP tunneled via SSH to a machine
-at MIT:
-.IP
-.EX
-% sshnet -m /net.alt amsterdam.lcs.mit.edu
-% aux/stub -d /net/mit
-% bind /net.alt/tcp /net/mit
-% con -l mit!plan9.bell-labs.com!whoami
-connected to mit!plan9.bell-labs.com!whoami on /net/mit/0
-i am 204.178.31.2 sysname achille you are 18.26.4.9 port 1248
-% 
-.EE
 .SH SOURCE
 .B /sys/src/cmd/aux/stub.c
 .SH SEE ALSO