Update index.yml

Updated to say device identity management and not device management

Author: SanDeo-MSFT

articles/active-directory/devices/index.yml

@@ -1,10 +1,10 @@
 ### YamlMime:YamlDocument
 documentType: LandingData
-title: Azure AD Device Management Documentation
+title: Azure AD Device Identity Management Documentation
 metadata:
   document_id: 
-  title: Azure Active Directory Device Management Documentation - Tutorials, concepts, references | Microsoft Docs
-  description: Learn how to configure and test Azure Active device management.
+  title: Azure Active Directory Device Identity Management Documentation - Tutorials, concepts, references | Microsoft Docs
+  description: Learn how to configure and manage device identities in Azure AD.
   services: active-directory
   ms.subservice: devices
   author: MicrosoftGuyJFlo
@@ -16,7 +16,7 @@ metadata:
   ms.date: 08/14/2018
   ms.author: joflore
 abstract:
-  description: "Through devices, your users are getting access to your corporate assets. To protect your corporate assets, as an IT administrator, you want to have control over these devices. This enables you to make sure that your users are accessing your resources from devices that meet your standards for security and compliance.<br>Device management is also the foundation for device-based conditional access. With device-based conditional access, you can ensure that access to resources in your environment is only possible with managed devices."
+  description: "Through devices in Azure AD, your users are getting access to your corporate assets. To protect your corporate assets, as an IT administrator, you want to manage these device identities in Azure AD. This enables you to make sure that your users are accessing your resources from devices that meet your standards for security and compliance.<br>Device Identity management is also the foundation for device-based conditional access. With device-based conditional access, you can ensure that access to resources in your environment is only possible with managed devices."
 sections:
 - title: Step-by-step tutorials
   items: