Update namespace-push-delivery-overview.md

Author: spelluru

articles/event-grid/namespace-push-delivery-overview.md

@@ -9,7 +9,7 @@ author: robece
 ms.author: robece
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-# Azure Event Grid namespaces - Push delivery
+# Azure Event Grid namespaces - Push delivery (Preview)
 
 This article builds on [push delivery with HTTP for Event Grid basic](push-delivery-overview.md) and provides essential information before you start using push delivery on Event Grid namespaces over HTTP protocol. This article is suitable for users who need to build applications to react to discrete events using Event Grid namespaces. If you're interested to know more about the difference between the Event Grid basic tier and the standard tier with namespaces, see [choose the right Event Grid tier for your solution](choose-right-tier.md).