fix incorrect user explanation

[jeremyschlatter]

Hello!

I just used nixos-anywhere for the first time. It went fairly smoothly except for this surprise this at the end of my logs:

### Waiting for the machine to become reachable again ###
ssh: connect to host 192.168.1.146 port 22: Connection refused
### Done! ###

It... "wait[ed] for the machine to become reachable again" only to stop immediately on a connection refused? Huh?

I looked through the nixos-anywhere source and it looks like this message is actually inverted -- we are waiting for the machine to become unreachable. I am deducing that from the fact that a previous step in the script that uses the same wait loop but says we are waiting for unreachability:

nixos-anywhere/src/nixos-anywhere.sh

Lines 417 to 418 in f99d120

	# wait for machine to become unreachable.
	while timeout_ssh_ -- exit 0; do sleep 1; done

There also used to be a comment here that said unreachable before the user message that says reachable was added in 0997908:

This PR changes the message back to say unreachable.

[Mic92]

Thanks!

[Mic92]

@mergify queue

[mergify]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at daf19ef