Update models.mdx

fern/build-with-sonic/models.mdx

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 title: Models
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-Cartesia provides a family of state-of-the-art state space machine models, including our highly-accurate, low-latency Sonic model for text-to-speech.
+Cartesia provides a family of state-of-the-art models, including our highly-accurate, low-latency Sonic model for text-to-speech.
 
 ## Overview