Update docs/configuring-playbook-jitsi.md: replace the obsolete details about LastN

The document has been removed with 9a955ef1b4.

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

docs/configuring-playbook-jitsi.md

@@ -169,7 +169,7 @@ These configurations:
 - **limit the maximum video resolution**, to save up resources on both server and clients
 - **suspend unused video layers** until they are requested again, to save up resources on both server and clients. Read more on this feature [here](https://jitsi.org/blog/new-off-stage-layer-suppression-feature/).
 - **disable audio levels** to avoid excessive refresh of the client-side page and decrease the CPU consumption involved
-- **limit the number of video feeds forwarded to each client**, to save up resources on both server and clients. As clients’ bandwidth and CPU may not bear the load, use this setting to avoid lag and crashes. This feature is available by default on other webconference applications such as Office 365 Teams (the number is limited to 4). Read how it works [here](https://github.com/jitsi/jitsi-videobridge/blob/master/doc/last-n.md) and performance evaluation on this [study](https://jitsi.org/wp-content/uploads/2016/12/nossdav2015lastn.pdf).
+- **limit the number of video feeds forwarded to each client**, to save up resources on both server and clients. As clients’ bandwidth and CPU may not bear the load, use this setting to avoid lag and crashes. This feature is available by default on other webconference applications such as Office 365 Teams (the number is limited to 4). Read how it works [here](https://github.com/jitsi/jitsi-videobridge/blob/5ff195985edf46c9399dcf263cb07167f0a2c724/doc/allocation.md).
 
 ### Example configurations