Fix typo

IPSec -> IPsec

Author: changeworld

articles/hdinsight/hdinsight-release-notes-archive.md

@@ -1510,7 +1510,7 @@ HDInsight now supports Premium ADLS Gen2 as primary storage account for HDInsigh
 A fault domain is a logical grouping of underlying hardware in an Azure data center. Each fault domain shares a common power source and network switch. Before HDInsight Kafka might store all partition replicas in the same fault domain. Starting from this release, HDInsight now supports automatically distribution of Kafka partitions based on Azure fault domains. 
 
 #### Encryption in transit
-Customers can enable encryption in transit between cluster nodes using IPSec encryption with platform-managed keys. This option can be enabled at the cluster creation time. See more details about [how to enable encryption in transit](./domain-joined/encryption-in-transit.md).
+Customers can enable encryption in transit between cluster nodes using IPsec encryption with platform-managed keys. This option can be enabled at the cluster creation time. See more details about [how to enable encryption in transit](./domain-joined/encryption-in-transit.md).
 
 #### Encryption at host
 When you enable encryption at host, data stored on the VM host is encrypted at rest and flows encrypted to the storage service. From this release, you can **Enable encryption at host on temp data disk** when creating the cluster. Encryption at host is only supported on [certain VM SKUs in limited regions](/azure/virtual-machines/disks-enable-host-based-encryption-portal). HDInsight supports the [following node configuration and SKUs](./hdinsight-supported-node-configuration.md). See more details about [how to enable encryption at host](./disk-encryption.md#encryption-at-host-using-platform-managed-keys).