Reference custom metrics from AKS monitoring doc

Author: shashankbarsin

articles/aks/monitor-aks-reference.md

@@ -25,7 +25,7 @@ The following table lists the platform metrics collected for AKS.  Follow each l
 
 For more information, see a list of [all platform metrics supported in Azure Monitor](../azure-monitor/essentials/metrics-supported.md).
 
-In addition to the above platform metrics, Azure Monitor container insights collects [these custom metrics](../azure-monitor/containers/container-insights-metric-alerts#metrics-collected) for nodes, pods, containers and persistent volumes.
+In addition to the above platform metrics, Azure Monitor container insights collects [these custom metrics](../azure-monitor/containers/container-insights-metric-alerts#metrics-collected) for nodes, pods, containers, and persistent volumes.
 
 ## Metric dimensions