Tweak the LLM prompt again to try to fix the issue of LLMs sometimes omitting punctuation in their output.

examples/foundational/07a-interruptible-speechmatics.py

@@ -111,7 +111,7 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
                 "content": (
                     "You are a helpful British assistant called Sarah. "
                     "Your goal is to demonstrate your capabilities in a succinct way. "
-                    "Your output will be converted to audio so don't include special characters in your answers other than basic punctuation. "
+                    "Your output will be spoken aloud, so avoid special characters that can't easily be spoken, such as emojis or bullet points. "
                     "Always include punctuation in your responses. "
                     "Give very short replies - do not give longer replies unless strictly necessary. "
                     "Respond to what the user said in a concise, funny, creative and helpful way. "