fix(dtmf): drop removed repeat_instructions arg from GetDtmfTask example and docstring (#6972)

Author: feizhuzheng

examples/telephony/basic_dtmf_agent.py

@@ -75,7 +75,6 @@ async def ask_for_service_options(self, context: RunContext) -> str:
                         "press 1 to hear details about their current plan, press 2 to enable international data roaming, "
                         "or press 3 to explore upgrade options. Prompt them for a single digit and give them a moment to respond."
                     ),
-                    repeat_instructions=2,
                 )
             except ToolError as e:
                 await self.session.generate_reply(instructions=e.message, allow_interruptions=False)
@@ -115,7 +114,6 @@ async def ask_for_phone_number(self, context: RunContext) -> str:
                         "Provide an example such as 415 555 0199, remind them you're keeping their information secure, "
                         "then capture the digits. Read the number back in grouped segments for confirmation and invite them to confirm or re-enter."
                     ),
-                    repeat_instructions=2,
                 )
             except ToolError as e:
                 await self.session.generate_reply(instructions=e.message, allow_interruptions=False)

livekit-agents/livekit/agents/beta/workflows/dtmf_inputs.py

@@ -49,7 +49,6 @@ def __init__(
         Args:
             num_digits: The number of digits to collect.
             ask_for_confirmation: Whether to ask for confirmation when agent has collected full digits.
-            repeat_instructions: The number of times to repeat the initial instructions.
             dtmf_input_timeout: The per-digit timeout.
             dtmf_stop_event: The DTMF event to stop collecting inputs.
             chat_ctx: The chat context to use.