Merge pull request #123888 from braieralves/patch-20

Update how-to-connect-to-data-source-privately.md

Author: Court72

articles/managed-grafana/how-to-connect-to-data-source-privately.md

@@ -25,7 +25,7 @@ While managed private endpoints are free, there may be charges associated with p
 
 Managed private endpoints work with Azure services that support private link. Using them, you can connect your Azure Managed Grafana workspace to the following Azure data stores over private connectivity:
 
-- Azure Cosmos DB for Mongo DB
+- Azure Cosmos DB for Mongo DB ([Only for Request Unit (RU) architecture](/azure/cosmos-db/mongodb/introduction#request-unit-ru-architecture))
 - Azure Cosmos DB for PostgreSQL
 - Azure Data Explorer
 - Azure Monitor private link scope (for example, Log Analytics workspace)