Update description of SessionKeepAliveUpdatesInterval

updated description of SessionKeepAliveUpdatesInterval per this thread: 
https://mendix.slack.com/archives/C3T260XGA/p1686322829829359
(and the linked one in #mxperts)

Author: tieniber

content/en/docs/refguide9/runtime/custom-settings/_index.md

@@ -66,7 +66,7 @@ The following custom settings can be configured:
 | <a id="LongLivedSessionTimeout" href="#LongLivedSessionTimeout">LongLivedSessionTimeout</a> | This setting is the same as `SessionTimeout`, but specific to offline-first progressive web apps. | 604800000 (7 days) |
 | <a id="MyScheduledEvents" href="#MyScheduledEvents">MyScheduledEvents</a> | A comma-separated string with the names of the events. Please don't forget the name of the module (a name can be, for example, `CRM.UpdateCustomerStatistics`). |   |
 | <a id="ScheduledEventExecution" href="#ScheduledEventExecution">ScheduledEventExecution</a> | Specify which scheduled events should be executed. Choices are `ALL`, `NONE`, or `SPECIFIED`. In the case of `SPECIFIED`, enumerate the scheduled events using the `MyScheduledEvents` configuration option described below. {{% alert color="warning" %}}This setting cannot be configured when running locally. To enable and disable scheduled events when running locally, please use the 'Enabled' setting on the [Scheduled Events execution properties](/refguide9/scheduled-events-task-queue/) in Studio Pro.{{% /alert %}} | NONE |
-| <a id="SessionKeepAliveUpdatesInterval" href="#SessionKeepAliveUpdatesInterval">SessionKeepAliveUpdatesInterval</a> | Defines after how much time expired sessions can be removed from the database. | one sixth of the value configured for the `SessionTimeout` setting; if the `SessionTimeout` is not set, this value defaults to 100000 (100 seconds) |
+| <a id="SessionKeepAliveUpdatesInterval" href="#SessionKeepAliveUpdatesInterval">SessionKeepAliveUpdatesInterval</a> | Defines how often a runtime writes session LastActive dates in its memory back to the database. | one sixth of the value configured for the `SessionTimeout` setting; if the `SessionTimeout` is not set, this value defaults to 100000 (100 seconds) |
 | <a id="SessionTimeout" href="#SessionTimeout">SessionTimeout</a> | Defines after how much time session becomes invalid (in milliseconds). After that timeout a session becomes applicable for removal. The session will not be destroyed until the next time the cluster manager evaluates the active sessions. | 600000 (10 minutes) |
 | <a id="TaskQueueShutdownGracePeriod" href="#TaskQueueShutdownGracePeriod">TaskQueue.<wbr>ShutdownGracePeriod</a> | Time in ms to wait for task in a task queue to finish when shutting down. | 10000 (10 seconds) |
 | <a id="TempPath" href="#TempPath">TempPath</a> | The location of the temporary files. | [deployment folder]\data\tmp |