[Realtime] Emit current (non-beta) OpenAI audio/transcript event names (#7339)

Signed-off-by: Nick Cao <ncao@redhat.com>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

docs/serving/full_duplex_api.md

@@ -86,7 +86,7 @@ A typical `/v1/realtime?duplex=1` session follows this lifecycle:
 3. Send `input_audio_buffer.append` events while microphone audio arrives.
 4. Send `input_audio_buffer.commit` at a user-turn boundary when required by
    the model policy.
-5. Consume `response.created`, transcript deltas, `response.audio.delta`, and
+5. Consume `response.created`, transcript deltas, `response.output_audio.delta`, and
    `response.done` or `response.listen` events.
 6. Send `playback.ack` after audio has been played when the session advertises
    playback acknowledgement support.