Improve ExternalSegment.Host doc comment
@@ -77,8 +77,10 @@ type ExternalSegment struct {
// protocol scheme (eg. "http://").
URL string
// Host is an optional field that is automatically populated from the
- // Request or URL. It is used for external metrics. Use this field to
- // override the host in the URL or Request.
+ // Request or URL. It is used for external metrics, transaction trace
+ // segment names, and span event names. Use this field to override the
+ // host in the URL or Request. This field does not override the host in
+ // the request.uri attribute.
Host string
// Method is an optional field that is automatically populated from the
// Request. It is used for external metrics and the "http.method" Span
