go-live update docs.yml

https://buildwithfern.com/learn/docs/building-your-docs/custom-domain#subdomain

Author: humford

fern/docs.yml

@@ -1,7 +1,7 @@
 instances:
   - url: https://vapi.docs.buildwithfern.com
-    # vv uncomment to go live vv
-    # custom-domain: docs.vapi.ai
+    # go live by uncommenting:
+    custom-domain: docs.vapi.ai
 
 announcement: 
   message: "🚀 Vapi now provides server SDKs! Check out the [supported languages](/server-sdks)."
@@ -351,4 +351,4 @@ navigation:
             href: https://api.vapi.ai/api
           - link: OpenAPI
             href: https://api.vapi.ai/api-json
-  
+