docs: add FAQ explaining why legacy voices are being phased out (#911)

Co-authored-by: Vapi Tasker <tasker@vapi.ai>

Author: vapi-tasker[bot]

fern/providers/voice/vapi-voices/legacy-migration.mdx

@@ -69,6 +69,10 @@ We've selected replacement voices from ElevenLabs using their voice matching too
 ## FAQs
 
 <AccordionGroup>
+  <Accordion title="Why are these voices being phased out?">
+    We're updating our voice library to ensure all voices meet our current licensing and consent standards.
+  </Accordion>
+
   <Accordion title="How were the replacement voices selected?">
     We used ElevenLabs' voice matching tool to find the most appropriate replacements for each legacy voice based on tone, style, and characteristics. Replacements should not change your pricing.
   </Accordion>