Update audio-streaming-concept.md

add image for bidirectional streaming flow

Author: valindrae

articles/communication-services/concepts/call-automation/audio-streaming-concept.md

@@ -36,7 +36,7 @@ This public preview supports the ability for developers to access real-time audi
 
 ## Sample architecture for subscribing to audio streams from an ongoing call - live agent scenario
 
-[![Screenshot of architecture diagram for audio streaming.](./media/audio-streaming-diagram.png)](./media/audio-streaming-diagram.png#lightbox)
+[![Screenshot of architecture diagram for audio streaming.](./media/bidirectional-streaming.png)](./media/bidirectional-streaming.png#lightbox)
 
 ## Supported formats