docs: remove "in multiple languages" for s2s docs

We do not want to advertise this just yet as we may start with only one language

Author: sj-dl

api-reference/voice.mdx

@@ -28,7 +28,7 @@ The Voice API provides a way to open WebSocket connections to transcribe and tra
 * Send a single audio stream
 * Receive transcripts in the source language
 * Receive translations in multiple target languages
-* <Badge color="green">closed beta</Badge> Receive translated speech in multiple target languages
+* <Badge color="green">closed beta</Badge> Receive translated speech
 
 The API uses a two-step flow:
 1. [**Request a streaming URL**](/api-reference/voice/request-session) via POST request