Add note to NoSQL samples Java documentation

Author: seesharprun

articles/cosmos-db/nosql/samples-java.md

@@ -147,9 +147,12 @@ The Analytical storage Collection CRUD Samples files for [sync](https://github.c
 | --- | --- | 
 | Create a collection | [CosmosDatabase.createContainerIfNotExists](https://github.com/Azure-Samples/azure-cosmos-java-sql-api-samples/blob/main/src/main/java/com/azure/cosmos/examples/analyticalcontainercrud/sync/AnalyticalContainerCRUDQuickstart.java#L91-L106) <br> [CosmosAsyncDatabase.createContainerIfNotExists](https://github.com/Azure-Samples/azure-cosmos-java-sql-api-samples/blob/0ead4ca33dac72c223285e1db866c9dc06f5fb47/src/main/java/com/azure/cosmos/examples/analyticalcontainercrud/async/AnalyticalContainerCRUDQuickstartAsync.java#L91-L106) |
 
-## Document examples
+## Item examples
 The Document CRUD Samples files for [sync](https://github.com/Azure-Samples/azure-cosmos-java-sql-api-samples/blob/main/src/main/java/com/azure/cosmos/examples/documentcrud/sync/DocumentCRUDQuickstart.java) and [async](https://github.com/Azure-Samples/azure-cosmos-java-sql-api-samples/blob/main/src/main/java/com/azure/cosmos/examples/documentcrud/async/DocumentCRUDQuickstartAsync.java) show how to perform the following tasks. To learn about the Azure Cosmos DB documents before running the following samples, see [Working with databases, containers, and items](../resource-model.md) conceptual article.
 
+> [!NOTE]
+> You must specify a partition key when performing operations against a specific item.
+
 | Task | API reference |
 | --- | --- |
 | Create a document | [CosmosContainer.createItem](https://github.com/Azure-Samples/azure-cosmos-java-sql-api-samples/blob/main/src/main/java/com/azure/cosmos/examples/documentcrud/sync/DocumentCRUDQuickstart.java#L132-L146) <br> [CosmosAsyncContainer.createItem](https://github.com/Azure-Samples/azure-cosmos-java-sql-api-samples/blob/0ead4ca33dac72c223285e1db866c9dc06f5fb47/src/main/java/com/azure/cosmos/examples/documentcrud/async/DocumentCRUDQuickstartAsync.java#L188-L212) |