chore(structure): update doc

Author: krokoko

samples/speech-to-speech/README.md

@@ -186,7 +186,7 @@ $ aws cloudformation describe-stacks --stack-name NovaSonicSolutionBackendStack
 5. The assistant will automatically process your message and respond through speech
 6. Click "Stop Streaming" when you're done
 
-![Speech to Speech Interface](docs/images/speechToSpeech_sample.png)
+![Speech to Speech Interface](docs/images/speechToSpeech_home.png)
 
    
 > Note: Ensure your microphone is properly connected and working before testing. The browser may require you to grant microphone permissions the first time you use the feature.