Correct `Fresh` to `Compiling` since we aren't running with -v

Correct `Fresh` to `Compiling` since we aren't running with -v

I only see `Fresh` if I use `cargo run -v`, but this example uses `cargo
run`. Someone following along might not see either of these if they just
built in the previous step, though, so clarify that you'll only see that
if you have made changes.