docs: update legacy voice migration with staying voices

- Add section listing voices that are staying (not being retired)
- Clarify that Elliot, Savannah, Leo, Zoe, Mia, Jess, Zac, Dan, Leah, Tara will continue to be supported
- Add FAQ about staying voices
- Reorganize document with clear section headers

Author: Vapi Tasker

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

@@ -6,7 +6,11 @@ slug: providers/voice/vapi-voices/legacy-migration
 
 ## Voice availability update
 
-We're updating Vapi Voices. The following legacy voices are being phased out and will be retired on **March 1, 2026**:
+We're updating Vapi Voices. Some legacy voices are being phased out while others will continue to be available.
+
+### Voices being retired on March 1, 2026
+
+The following voices will be retired and are no longer available for new assistants:
 
 - Spencer
 - Neha
@@ -18,6 +22,25 @@ We're updating Vapi Voices. The following legacy voices are being phased out and
 - Kylie
 - Rohan
 
+### Voices that are staying
+
+The following Vapi Voices will continue to be fully supported and are **not** being retired:
+
+- Elliot
+- Savannah
+- Leo
+- Zoe
+- Mia
+- Jess
+- Zac
+- Dan
+- Leah
+- Tara
+
+<Note>
+If you're currently using one of the voices that are staying, no action is required on your part.
+</Note>
+
 ## What this means
 
 - **Existing assistants** using these voices will continue to work during the transition period
@@ -77,4 +100,8 @@ We've selected replacement voices from ElevenLabs using their voice matching too
   <Accordion title="Who can I contact if I have questions?">
     Reach out to [support@vapi.ai](mailto:support@vapi.ai) or contact your account team if you're an Enterprise customer.
   </Accordion>
+
+  <Accordion title="Are the staying voices (Elliot, Savannah, Leo, etc.) affected?">
+    No. Elliot, Savannah, Leo, Zoe, Mia, Jess, Zac, Dan, Leah, and Tara are continuing and are not being retired. If you're using one of these voices, no action is required.
+  </Accordion>
 </AccordionGroup>