Delete a document in DynamoDB, identified by a hash primary key,
            using specified configs.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Document DeleteItem( Primitive hashKey, DeleteItemOperationConfig config )
 Parameters
 Parameters- hashKey (Primitive)
- Hash key element of the document.
- config (DeleteItemOperationConfig)
- Configuration to use.
 Return Value
 Return ValueNull or old attributes, depending on config.