updates author metadata

Author: davidsmatlak

articles/azure-resource-manager/custom-providers/index.yml

@@ -8,8 +8,8 @@ metadata:
   description: Azure Custom Resource Providers is an extensibility platform to Azure that enables you to define custom APIs.
   ms.service: azure-custom-providers
   ms.topic: landing-page
-  author: davidsmatlak
-  ms.author: davidsmatlak
+  author: MSEvanhi
+  ms.author: evanhi
   ms.date: 01/02/2020
 
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