Update mongodb-indexing.md

Edited article title to "Manage indexing in Azure Cosmos DB's API for MongoDB".

Author: denrea

articles/cosmos-db/mongodb-indexing.md

@@ -10,7 +10,7 @@ author: timsander1
 ms.author: tisande
 
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-# Manage indexing in the Azure Cosmos DB API for MongoDB
+# Manage indexing in Azure Cosmos DB's API for MongoDB
 
 Azure Cosmos DB's API for MongoDB takes advantage of the core index-management capabilities of Azure Cosmos DB. This article focuses on how to add indexes using Azure Cosmos DB's API for MongoDB. You can also read an [overview of indexing in Azure Cosmos DB](index-overview.md) that's relevant across all APIs.