fix: correct TTS supported voices documentation link

The "View all supported voices here" link pointed to the wrong anchor
(#voices-available). Updated to the correct anchor (#supported-voices).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rishabh-bhargava

openapi.yaml

@@ -9768,7 +9768,7 @@ components:
             <br>
             <br>
             You can view the voices supported for each model using the /v1/voices endpoint sending the model name as the query parameter.
-            [View all supported voices here](https://docs.together.ai/docs/text-to-speech#voices-available).
+            [View all supported voices here](https://docs.together.ai/docs/text-to-speech#supported-voices).
           type: string
         response_format:
           type: string