fix typo

Author: mumian

articles/azure-resource-manager/deployment-manager-overview.md

@@ -31,7 +31,7 @@ Additional resources:
 - The [Azure Deployment Manager REST API reference](https://docs.microsoft.com/rest/api/deploymentmanager/).
 - [Tutorial: Use Azure Deployment Manager with Resource Manager templates](./deployment-manager-tutorial.md).
 - [Tutorial: Use health check in Azure Deployment Manager](./deployment-manager-tutorial-health-check.md).
-- [A Azure Deployment Manager sample](https://github.com/Azure-Samples/adm-quickstart).
+- [An Azure Deployment Manager sample](https://github.com/Azure-Samples/adm-quickstart).
 
 ## Identity and access
 

articles/azure-resource-manager/deployment-manager-tutorial-health-check.md

@@ -41,7 +41,7 @@ This tutorial covers the following tasks:
 Additional resources:
 
 - The [Azure Deployment Manager REST API reference](https://docs.microsoft.com/rest/api/deploymentmanager/).
-- [A Azure Deployment Manager sample](https://github.com/Azure-Samples/adm-quickstart).
+- [An Azure Deployment Manager sample](https://github.com/Azure-Samples/adm-quickstart).
 
 If you don't have an Azure subscription, [create a free account](https://azure.microsoft.com/free/) before you begin.
 

articles/azure-resource-manager/deployment-manager-tutorial.md

@@ -45,7 +45,7 @@ Additional resources:
 
 - The [Azure Deployment Manager REST API reference](https://docs.microsoft.com/rest/api/deploymentmanager/).
 - [Tutorial: Use health check in Azure Deployment Manager](./deployment-manager-tutorial-health-check.md).
-- [A Azure Deployment Manager sample](https://github.com/Azure-Samples/adm-quickstart).
+- [An Azure Deployment Manager sample](https://github.com/Azure-Samples/adm-quickstart).
 
 If you don't have an Azure subscription, [create a free account](https://azure.microsoft.com/free/) before you begin.