Fix: Updated MaxTasksPerNode documentation (#279)

* Added comment on maxTasksPerNode * Added bolded note * After comments
Azure · Jun 7, 2018 · 8e39df1 · 8e39df1
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diff --git a/docs/80-performance-tuning.md b/docs/80-performance-tuning.md
@@ -24,6 +24,8 @@ Here's an example of how you may want to set your JSON configuration file:
 }
 ```
 
+**Note**: `maxTasksPerNode` property cannot be changed after the cluster has been provisioned. The cluster must be torn down and reprovisioned with the new `maxTasksPerNode` property.
+
 ### Nested doParallel 
 To take advantage of all the cores on each node, you can nest a *foreach* loop using *doParallel* package inside the outer *foreach* loop that uses doAzureParallel.