Correct cosmos db emulator source statement

Only the dockerfile and more info is available in the GitHub repo, not the source

Author: Tyriar

articles/cosmos-db/local-emulator.md

@@ -22,7 +22,7 @@ While emulation of the Azure Cosmos DB service is faithful, the emulator's imple
 
 You can migrate data between the Azure Cosmos Emulator and the Azure Cosmos DB service by using the [Azure Cosmos DB Data Migration Tool](https://github.com/azure/azure-documentdb-datamigrationtool).
 
-You can run Azure Cosmos Emulator on the Windows Docker container, see the [Docker Hub](https://hub.docker.com/r/microsoft/azure-cosmosdb-emulator/) for the docker pull command and [GitHub](https://github.com/Azure/azure-cosmos-db-emulator-docker) for the emulator source code.
+You can run Azure Cosmos Emulator on the Windows Docker container, see the [Docker Hub](https://hub.docker.com/r/microsoft/azure-cosmosdb-emulator/) for the docker pull command and [GitHub](https://github.com/Azure/azure-cosmos-db-emulator-docker) for the `Dockerfile` and more information.
 
 ## Differences between the emulator and the service