Move 'restart Emacs to see changes' message to 'doom sync'

It isn't the autoloads generator's responsibility to do this. The
"changes" referred to consist of more than just the regenerated
autoloads file.

core/core-cli.el

@@ -405,7 +405,8 @@ stale."
      (doom-cli-packages-update))
    (doom-cli-packages-purge prune-p 'builds-p prune-p prune-p)
    (run-hooks 'doom-sync-post-hook)
-   (doom-autoloads-reload)
+   (when (doom-autoloads-reload)
+     (print! (info "Restart Emacs or use 'M-x doom/reload' for changes to take effect")))
    t))
 
 (load! "cli/env")