docs: Speechify TTS plugin page example uses a retired model (simba-english), plugin already defaults to simba-3.2

[vitalragaz]

The Speechify TTS plugin page in the docs (https://docs.livekit.io/agents/models/tts/plugins/speechify) shows this example:

tts=speechify.TTS(
   model="simba-english",
   voice_id="jack",
)

simba-english (and simba-multilingual, also listed on that page) are Speechify's Simba 1.6 models. They are retired for new integrations from Speechify API version 2026-09-21, so a developer on a new account who copies this example gets a 400 model_retired on the first call. From 2026-11-21 both ids are served by Speechify's current models (Speechify's models guide: https://docs.speechify.ai/build/guides/concepts/models#simba-16-and-your-api-version).

The plugin itself is already current: livekit-plugins/livekit-plugins-speechify/livekit/plugins/speechify/tts.py defaults to DEFAULT_MODEL = "simba-3.2" and DEFAULT_VOICE_ID = "dominic_32". Only the docs page lags.

Suggested fix for the docs example:

tts=speechify.TTS(
   model="simba-3.2",
   voice_id="dominic_32",
)

with simba-3.0 named as the model for non-English voices, and the two Simba 1.6 ids removed from the model list or marked retired. The plugin also produces word timestamps on the streaming models (simba-3.0 and simba-3.2), which the page could mention.

Happy to help with the wording. I work on the Speechify API.