execnet(4): remove reference to ssh(1)

sys/man/4/execnet

@@ -28,35 +28,8 @@ the form
 .IB name ! cmd
 will connect to a newly executed instance of
 .IR cmd .
-.SH EXAMPLE
-.I Execnet
-can be used to connect to instances of u9fs
-running on other hosts:
-.EX
-    g% execnet
-    g% srv -m 'exec!ssh ny start-u9fs' ny /n/ny
-.EE
-This example assumes that the remote command
-.B start-u9fs
-executed on
-.B ny
-will start
-.I u9fs
-appropriately.
-For example, it might be:
-.EX
-    ny% cat start-u9fs
-    #!/bin/sh
-
-    u9fs -na none -u $USER -l $HOME/tmp/u9fs.log
-    ny%
-.EE
 .SH SOURCE
 .B /sys/src/cmd/execnet
 .SH "SEE ALSO
 .IR dial (2),
 .IR ip (3),
-.SH BUGS
-Almost certainly:
-.IR execnet
-has only been tested as in the example shown.