fix: updated client base url templating and docs (#2)

* Docs update and a fix * Formatting

Author: shwetha-manvinkurke

src/main/resources/twilio-go/README.mustache

@@ -5,7 +5,7 @@
 {{/appDescriptionWithNewLines}}
 
 ## Overview
-This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project. By using the [OpenAPI-spec](https://www.openapis.org/) from a remote server, you can easily generate an API client.
+This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project from the OpenAPI specs located at [twilio/twilio-oai](https://github.com/twilio/twilio-oai/tree/main/spec). By using the [OpenAPI-spec](https://www.openapis.org/) from a remote server, you can easily generate an API client.
 
 - API version: {{appVersion}}
 - Package version: {{packageVersion}}

src/main/resources/twilio-go/api.mustache

@@ -19,7 +19,7 @@ type {{classname}}Service struct {
 func New{{classname}}Service(client *twilio.Client) *{{classname}}Service {
 return &{{classname}}Service {
 client: client,
-baseURL: fmt.Sprintf("https://studio.%s", client.BaseURL),
+baseURL: fmt.Sprintf("{{#operation}}{{#-first}}{{#servers}}{{url}}{{/servers}}{{/-first}}{{/operation}}"),
 }
 }
 {{#operation}}