Update manage-network-function-operator.md

corrections for gc parameters

Author: msftadam

articles/operator-service-manager/manage-network-function-operator.md

@@ -156,7 +156,7 @@ The referenced matchCondition implies that the pods getting accepted in kube-sys
 * This configuration specified as an empty string disable the scheduled job, allowing customers to opt out of running garbage collection.
 * Default value: "0 0 * * *" -- Runs the job once everyday.
 
-`--config global.networkfunctionextension.backgroundJobThreshold=`
+`--config global.networkfunctionextension.clusterRegistry.clusterRegistryGCThreshold=`
 * This configuration specifies the precent threshold value to trigger the cluster registry garbage collection process.
 * This configuration triggers garbage collection process when cluster registry usage exceeds this value.
 * Default value: 0.