make it more explicit where the password/keys are stored

tsa/howto/ganeti.mdwn

@@ -114,9 +114,11 @@ This configures the following:
    of the instance, see below.
  * with the `test01.torproject.org` hostname
 
-To find the root password, ssh host key fingerprints, and the IPv6 address, run this on the node where the instance was created:
+To find the root password, ssh host key fingerprints, and the IPv6
+address, run this **on the node where the instance was created**, for
+example:
 
-    egrep 'root password|configured eth0 with|SHA256' $(ls -tr /var/log/ganeti/os/* | tail -1) | grep -v $(hostname)
+    ssh root@fsn-node-02.torproject.org "egrep 'root password|configured eth0 with|SHA256' $(ls -tr /var/log/ganeti/os/* | tail -1) | grep -v $(hostname)"
 
 Note that you need to use the `--node` parameter to pick on which
 machines you want the machine to end up, otherwise Ganeti will choose