Update custom-proxy.md

Author: stayseesong

src/connections/sources/catalog/libraries/website/javascript/custom-proxy.md

@@ -63,7 +63,7 @@ A Segment Customer Success team member will respond that they have enabled this
 > info ""
 > The **Host Address** field does not appear in source settings until it's enabled by Segment Customer Success.
 
-Once the setup is complete, there should be no downtime, as the default Segment domains continue to work alongside the customer's domains. 
+There should be no downtime once the setup is complete, as the default Segment domains continue to work alongside the customer's domains. 
 
 
 ## Custom CDN / API Proxy