Service name default

Author: sjberman

docs/proposals/gateway-settings.md

@@ -82,7 +82,8 @@ type Telemetry struct {
 	Exporter *TelemetryExporter `json:"exporter,omitempty"`
 
 	// ServiceName is the "service.name" attribute of the OpenTelemetry resource.
-	// Default is 'nginx-gateway-fabric:<gateway-name>'.
+	// Default is 'ngf:<gateway-namespace>:<gateway-name>'. If a value is provided by the user,
+	// the the default becomes a prefix to that value.
 	// +optional
 	ServiceName *string `json:"serviceName,omitempty"`