make it clear that byok is not needed for stock replicas

fern/customization/custom-voices/tavus.mdx

@@ -7,7 +7,7 @@ slug: customization/custom-voices/tavus
 
 This guide outlines the procedure for integrating your custom replica with Tavus through the VAPI platform.
 
-<Note>An API subscription is required for this process to work.</Note>
+<Note>An API subscription is required for this process to work. This process is only required if you would like to use your **custom Tavus replicas**. This process is not required to use stock replicas on the Vapi platform.</Note>
 
 To integrate your custom replica with [Tavus](https://platform.tavus.io/) using the VAPI platform, follow these steps.