docs: update TTS event name in changeset from output_timestamps to output_alignment (#1370)

Co-authored-by: detail-app[bot] <180357370+detail-app[bot]@users.noreply.github.com>

Author: detail-app[bot]

.changeset/inference-tts-aligned-timestamps.md

@@ -2,4 +2,4 @@
 "@livekit/agents": patch
 ---
 
-feat(inference/tts): detect aligned transcript capability from provider `modelOptions` (`cartesia.add_timestamps`, `elevenlabs.sync_alignment`, `inworld.timestamp_type`) and forward the gateway's `output_timestamps` WebSocket events as `TimedString` word/character timings attached to the next synthesized audio frame. Ported from livekit/agents#5534.
+feat(inference/tts): detect aligned transcript capability from provider `modelOptions` (`cartesia.add_timestamps`, `elevenlabs.sync_alignment`, `inworld.timestamp_type`) and forward the gateway's `output_alignment` WebSocket events as `TimedString` word/character timings attached to the next synthesized audio frame. Ported from livekit/agents#5534.