Emulator link fix

Author: rinatmini

articles/cosmos-db/nosql/how-to-java-change-feed.md

@@ -23,7 +23,7 @@ Azure Cosmos DB is a fully managed NoSQL database service provided by Microsoft.
 
 ## Prerequisites
 
-* Azure Cosmos DB Account: you can create it from the [Azure portal](https://portal.azure.com/) or you can use [Azure Cosmos DB Emulator](../local-emulator) as well.
+* Azure Cosmos DB Account: you can create it from the [Azure portal](https://portal.azure.com/) or you can use [Azure Cosmos DB Emulator](../local-emulator.md) as well.
 
 * Java Development Environment: Ensure you have Java Development Kit (JDK) installed on your machine with at least 8 version.