Update hdinsight-capacity-planning.md

Author: sreekzz

articles/hdinsight/hdinsight-capacity-planning.md

@@ -65,7 +65,7 @@ For more information on how to choose the right VM family for your workload, see
 
 ## Choose the cluster scale
 
-A cluster's scale is determined by the quantity of its VM nodes. For all cluster types, there are node types that have a specific scale, and node types that support scale-out. For example, a cluster may  require exactly three [Apache ZooKeeper](https://zookeeper.apache.org/) nodes or two Head nodes. Worker nodes that do data processing in a distributed fashion benefit from the another worker nodes.
+A cluster's scale is determined by the quantity of its VM nodes. For all cluster types, there are node types that have a specific scale, and node types that support scale-out. For example, a cluster may  require exactly three [Apache ZooKeeper](https://zookeeper.apache.org/) nodes or two Head nodes. Worker nodes that do data processing in a distributed fashion benefit from another worker nodes.
 
 Depending on your cluster type, increasing the number of worker nodes adds more computational capacity (such as more cores). More nodes will increase the total memory required for the entire cluster to support in-memory storage of data being processed. As with the choice of VM size and type, selecting the right cluster scale is typically reached empirically. Use simulated workloads or canary queries.