Fix error.

Author: TimShererWithAquent

.openpublishing.redirection.json

@@ -4806,7 +4806,8 @@
             "source_path_from_root": "/articles/azure-resource-manager/management/control-plane-metrics.md",
              "redirect_url": "/azure/azure-resource-manager/management/monitor-resource-manager",
              "redirect_document_id": false
-         },        
+        },
+	{
            "source_path_from_root": "/articles/expressroute/expressroute-monitoring-metrics-alerts.md",
             "redirect_url": "/azure/expressroute/monitor-expressroute-reference",
             "redirect_document_id": false