docs: update nat-traversal

Author: jmattheis

docs/faq.md

@@ -5,7 +5,7 @@
 Check that
 * you are using https to access Screego.
 * `SCREEGO_EXTERNAL_IP` is set to your external IP. See [Configuration](config.md)
-* you are using TURN for NAT-Traversal. See [NAT-Traversal](nat-traversal.md). *This isn't allowed for app.screego.net, you've to self-host Screego*
+* you are using TURN for NAT-Traversal. See [NAT-Traversal](nat-traversal.md). *On app.screego.net it's enabled without login; when self-hosting it requires user login*
 * your browser doesn't block WebRTC (extensions or other settings)
 * you have opened ports in your firewall. By default 5050, 3478 and any UDP port when using TURN.