Update howto-prepare-cluster.md

and -> an

Author: JLuzz

articles/iot-operations/deploy-iot-ops/howto-prepare-cluster.md

@@ -76,7 +76,7 @@ To prepare an Azure Arc-enabled Kubernetes cluster, you need:
 
 ---
 
-## Create and Arc-enable a cluster
+## Create an Arc-enable a cluster
 
 This section provides steps to create clusters in validated environments on Linux and Windows.