Update audio-streaming-quickstart-js.md

applied PR comments - sentence case

Author: alvin-l-han

articles/communication-services/how-tos/call-automation/includes/audio-streaming-quickstart-js.md

@@ -39,7 +39,7 @@ const options: CreateCallOptions = {
 }; 
 ```
 
-## Start Audio Streaming
+## Start audio streaming
 How to start audio streaming:
 ``` JS
 const streamingOptions: StartMediaStreamingOptions = { 
@@ -65,7 +65,7 @@ The metadata packet will look like this:
 ```
 
 
-## Stop Audio Streaming
+## Stop audio streaming
 How to stop audio streaming
 ``` JS
 const stopMediaStreamingOptions: StopMediaStreamingOptions = {