update

Author: zhengkezhou1

content/en/docs/languages/go/instrumentation.md

@@ -512,6 +512,7 @@ import (
 var itemsCounter metric.Int64UpDownCounter
 
 func init() {
+	var err error
 	itemsCounter, err := meter.Int64UpDownCounter(
 		"items.counter",
 		metric.WithDescription("Number of items."),
@@ -554,6 +555,7 @@ var (
 )
 
 func init() {
+	var err error
 	speedGauge, err := meter.Int64Gauge(
 		"cpu.fan.speed",
 		metric.WithDescription("Speed of CPU fan"),