Update how-to-implement-a-producer-consumer-dataflow-pattern.md (#6054)

* Update how-to-implement-a-producer-consumer-dataflow-pattern.md

Typo when referring to the first code example.

* Update how-to-implement-a-producer-consumer-dataflow-pattern.md

Author: ferdeen

docs/standard/parallel-programming/how-to-implement-a-producer-consumer-dataflow-pattern.md

@@ -38,7 +38,7 @@ This document describes how to use the TPL Dataflow Library to implement a produ
  **vbc.exe /r:System.Threading.Tasks.Dataflow.dll DataflowProducerConsumer.vb**  
 
 ## Robust Programming  
- This example uses just one consumer to process the source data. If you have multiple consumers in your application, use the <xref:System.Threading.Tasks.Dataflow.IReceivableSourceBlock%601.TryReceive%2A> method to read data from the source block, as shown in the following example.  
+ The preceding example uses just one consumer to process the source data. If you have multiple consumers in your application, use the <xref:System.Threading.Tasks.Dataflow.IReceivableSourceBlock%601.TryReceive%2A> method to read data from the source block, as shown in the following example.  
 
  [!code-csharp[TPLDataflow_ProducerConsumer#2](../../../samples/snippets/csharp/VS_Snippets_Misc/tpldataflow_producerconsumer/cs/dataflowproducerconsumer.cs#2)]
  [!code-vb[TPLDataflow_ProducerConsumer#2](../../../samples/snippets/visualbasic/VS_Snippets_Misc/tpldataflow_producerconsumer/vb/dataflowproducerconsumer.vb#2)]