DOCS-12492: Added section about controlling cleanupOrphaned impact

Moved section and linked to chunk migration page

Author: niccottrell

source/reference/command/cleanupOrphaned.txt

@@ -127,6 +127,19 @@ you may prefer to include a pause in-between iterations.
 Alternatively, to mitigate the impact of :dbcommand:`cleanupOrphaned`,
 you may prefer to run the command at off peak hours.
 
+It is also possible to tune the performance impact of :dbcommand:`cleanupOrphaned`
+with two server parameters :parameter:`rangeDeleterBatchSize`
+and :parameter:`rangeDeleterBatchDelayMS`
+
+To limit the number of documents deleted per batch, you can set
+`rangeDeleterBatchSize` to a small value such as `32`.
+
+To add an additional delay between batch deletions, you can set
+`rangeDeleterBatchDelayMS` above the current default of `20` milliseconds.
+
+Note that these affect all range deletion including normal
+:doc:`chunk migration</core/sharding-balancer-administration/#chunk-migration-procedure>`.
+
 .. _cleanupOrphaned-determine-range:
 
 Determine Range