clarify regional instructions for go server

Author: Thomas Gilbert

src/connections/sources/catalog/libraries/server/go/index.md

@@ -41,11 +41,17 @@ That will create a `client` that you can use to send data to Segment for your so
 The default initialization settings are production-ready and queue 20 messages before sending a batch request, and a 5 second interval.
 
 ### Regional configuration
-For Business plans with access to Regional Segment, you can use the host configuration parameter to send data to the desired region:
+For Business plans with access to Regional Segment, you can use the endpoint configuration parameter to send data to the desired region:
 
-Oregon (Default) — api.segment.io/
-Dublin — events.eu1.segmentapis.com
+- Oregon (Default) — https://api.segment.io
+- Dublin — https://events.eu1.segmentapis.com
 
+Example configuration for EU region:
+```go
+client, err := analytics.NewWithConfig(writeKey, analytics.Config{
+    Endpoint: "https://events.eu1.segmentapis.com",
+})
+```
 ## Identify
 
 > note ""