adjust wording for domain in subdir section

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

readme.md

@@ -285,7 +285,7 @@ No and it will not be added. However you can use [this feature](https://github.c
 No and they will not be. Please use a dedicated domain for Nextcloud and set it up correctly by following the [reverse proxy documentation](./reverse-proxy.md). If port 443 and/or 80 is blocked for you, you may use the a Cloudflare Tunnel if you want to publish it online. You could also use the ACME DNS-challenge to get a valid certificate. However in all cases the Nextcloud interface will redirect you to port 443.
 
 ### Can I run Nextcloud in a subdirectory on my domain?
-No and it will not be added. Please use a dedicated domain for Nextcloud and set it up correctly by following the [reverse proxy documentation](./reverse-proxy.md).
+No and it will not be added. Please use a dedicated (sub-)domain for Nextcloud and set it up correctly by following the [reverse proxy documentation](./reverse-proxy.md).
 
 ### How can I access Nextcloud locally?
 Please note that local access is not possible if you are running AIO behind Cloudflare Tunnel since TLS proxying is in that case offloaded to Cloudflares infrastructure. You can fix this by setting up your own reverse proxy that handles TLS proxying locally and will make the steps below work.