update plex readme to use a better link

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

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

community-containers/plex/readme.md

@@ -5,7 +5,7 @@ This container bundles Plex and auto-configures it for you.
 - This is not working on arm64 since Plex does only provide x64 docker images.
 - This is not working on Docker Desktop since it needs `network_mode: host` in order to work correctly.
 - If you have a firewall like ufw configured, you might need to open all Plex ports in there first in order to make it work. Especially port 32400 is important!
-- After adding and starting the container, you need to visit http://ip.address.of.server:32400 in order to claim your server with a plex account
+- After adding and starting the container, you need to visit http://ip.address.of.server:32400/manage in order to claim your server with a plex account
 - The data of Plex will be automatically included in AIOs backup solution!
 - See https://github.com/nextcloud/all-in-one/tree/main/community-containers#community-containers how to add it to the AIO stack