[VID-71] update session timers docs (#764)

docusaurus/video/docusaurus/docs/api/basics/calls.mdx

@@ -849,6 +849,8 @@ curl -X POST "https://video.stream-io-api.com/api/v2/video/call/${CALL_TYPE}/${C
 You can limit the maximum duration for calls. This limit can be set for individual calls or set to a default value for all calls with the same type.
 When set, users will be automatically removed from a call when the time runs out and the call will be marked as ended.
 
+Please note that by default, most call types are configured so that users can join ended calls. To ensure session timers work correctly, the `JoinEndedCall` permission should be disabled at the call level. This can be done from the dashboard.
+
 ### Call type configuration
 
 You can configure all calls to have a default max duration, this can be done from the Dashboard (Call Type Settings) or using the API.