Update docs/configuring-playbook-jitsi.md: remove the obsolete notice about Element mobile apps not supporting self-hosted Jitsi server

The notice has been obsolete since 993fd04353 (for Android) and 0142bb04e4 (for iOS)

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-jitsi.md

@@ -290,8 +290,6 @@ You can use the self-hosted Jitsi server in multiple ways:
 
 - **directly (without any Matrix integration)**. Just go to `https://jitsi.example.com`
 
-**Note**: Element apps on mobile devices currently [don't support joining meetings on a self-hosted Jitsi server](https://github.com/element-hq/riot-web/blob/601816862f7d84ac47547891bd53effa73d32957/docs/jitsi.md#mobile-app-support).
-
 ## Troubleshooting
 
 ### Rebuilding your Jitsi installation