Fixed include path

Author: jboback

articles/cognitive-services/language-service/summarization/overview.md

@@ -15,7 +15,7 @@ ms.custom: language-service-summarization, ignite-fall-2021, event-tier1-build-2
 
 # What is document and conversation summarization (preview)?
 
-[!INCLUDE [availability](../regional-availability.md)]
+[!INCLUDE [availability](includes/regional-availability.md)]
 
 Summarization is one of the features offered by [Azure Cognitive Service for Language](../overview.md), a collection of machine learning and AI algorithms in the cloud for developing intelligent applications that involve written language. Use this article to learn more about this feature, and how to use it in your applications.