update azure batch doc (#267)

docs/maya_azure_batch_avere_vfxt_demo.md

@@ -1,6 +1,12 @@
 # Video rendering with Maya, Azure Batch, and Avere vFXT for Azure
 
-This 60-minute demo takes you through rendering an animated movie using Maya, Batch, and the Avere vFXT cluster. 
+## Introduction
+
+Azure Batch enables you to seamlessly parallelize rendering workloads onto Azure virtual machines.  Azure Batch allows you to use your own virtual machine images, and provides pre-built render images with software like Maya and Arnold.  More information on Azure Batch and rendering including [reference rendering architectures](https://docs.microsoft.com/en-us/azure/batch/batch-rendering-architectures) can be found in the article ["Rendering using Azure"](https://docs.microsoft.com/en-us/azure/batch/batch-rendering-service).
+
+The [Avere vFXT](https://aka.ms/averedocs) is a natural fit with Azure Batch Rendering because it hides [storage latency](why_avere_for_rendering.md), by bringing the storage close to Azure Batch.
+
+This 60-minute demo takes you through rendering an animated movie using Azure Batch, Maya, and the Avere vFXT cluster.
 
 > The source code to produce the template is located [here](../src/tutorials/mayabatch).