Update content-version-cleanup.md

Added relevant information from https://docs.umbraco.com/umbraco-cms/reference/configuration/contentsettings#enablecleanup

Author: Jette94

14/umbraco-cms/fundamentals/data/content-version-cleanup.md

@@ -46,6 +46,8 @@ Additionally, it is possible to keep the feature enabled but mark specific versi
 
 It is worth noting that whilst we delete rows, we do not shrink database files or rebuild indexes. For upgraded sites with a lot of history you may wish to perform these tasks. If they are not part of your regular database maintenance plan already.
 
+If set to `true`, a scheduled job will delete historic content versions every hour, while setting it to `false` will never delete any content versions regardless of settings. For more information on this, see [EnableCleanup](../../reference/configuration/contentsettings.md#enablecleanup).
+
 ## Overriding global settings
 
 It is possible to override the global settings per Document Type in the backoffice to prevent unwanted cleanup. This can be managed in the "permissions" Content App for each Document Type.