Update .env.example

Author: plutoless

.env.example

@@ -6,8 +6,8 @@ AGORA_APP_CERT=
 OPENAI_API_KEY=
 OPENAI_MODEL=
 
-# port of api server
+# port of api server, the default value is 8080 if not specified
 SERVER_PORT=
 
 # override this if you want to develop against a local dev server
-# REALTIME_API_BASE_URI=ws://localhost:8081
+# REALTIME_API_BASE_URI=ws://localhost:8081