cloudflare - add note about the hpb for talk

Signed-off-by: Simon L <szaimen@e.mail.de>

readme.md

@@ -132,6 +132,7 @@ The easiest way to run it with Portainer on Linux is to use Portainer's stacks f
 - It is very likely that the in AIO included collabora (Nextcloud Office) does not work out of the box behind Cloudflare. You need to follow https://github.com/nextcloud/all-in-one/discussions/1358 in order to resolve this yourself. There is unfortunately no secure way to automate this for you.
 - If you get an error in Nextcloud's admin overview that the HSTS header is not set correctly, you might need to enable it in Cloudflare manually.
 - If you are using AIO's built-in Reverse Proxy and don't use your own, then may the certificate issuing possibly not work out-of-the-box because Cloudflare might block the attempt. In that case you need to disable the Proxy feature at least temporarily in order to make it work. See https://github.com/nextcloud/all-in-one/discussions/1101.
+- The built-in High performance backend for Nextcloud Talk will potentially not work out-of-the-box since it needs a separate port (by default 3478 or as chosen) available on the same domain. If you still want to use the feature, you will need to adjust and test your settings in `https://yourdomain.com/settings/admin/talk`.
 
 ### How to run Nextcloud behind a Cloudflare Tunnel?
 Although it does not seems like it is the case but from AIO perspective a Cloudflare Tunnel works like a reverse proxy. So please follow the [reverse proxy documentation](./reverse-proxy.md) where is documented how to make it run behind a Cloudflare Tunnel.