Update index.md

this destination does not support LTV based audiences as of now  and the docs are not clear about this. This is creating confusion with some customers.
Example of a ticket: https://segment.zendesk.com/agent/tickets/560341

Author: segment-voliveira

src/connections/destinations/catalog/personas-facebook-custom-audiences/index.md

@@ -151,4 +151,4 @@ Most likely, this is due to your Facebook account needing to be reauthorized, so
 Note, emails must be in a plain text format. Facebook also provides these guidelines for the emails that you send to them: trim leading, trail whitespace, and convert all characters to lowercase.
 
 ### Do you support LTV audiences?
-Facebook has a feature called [value-based audiences](https://developers.facebook.com/docs/marketing-api/audiences/guides/value-based-lookalike-audiences/){:target="_blank"} where you can send an additional field like LTV, to tell Facebook how to optimize their advertising based on a customer's value. 
+Facebook has a feature called [value-based audiences](https://developers.facebook.com/docs/marketing-api/audiences/guides/value-based-lookalike-audiences/){:target="_blank"} where you can send an additional field like LTV, to tell Facebook how to optimize their advertising based on a customer's value. The Facebook Custom Audiences destination does not support value based audiences as of now. If you're interested in having this feature, let our support team so we can track the request.