Update Go instrumentation semconv examples (#4833)

Co-authored-by: Sam Xie <sam@samxie.me>
Co-authored-by: Phillip Carter <pcarter@fastmail.com>

Author: 3 people

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

@@ -39,7 +39,7 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/sdk/resource"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
-	semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 	"go.opentelemetry.io/otel/trace"
 )
 
@@ -187,7 +187,7 @@ span.SetAttributes(myKey.String("a value"))
 Semantic Attributes are attributes that are defined by the [OpenTelemetry
 Specification][] in order to provide a shared set of attribute keys across multiple
 languages, frameworks, and runtimes for common concepts like HTTP methods, status
-codes, user agents, and more. These attributes are available in the `go.opentelemetry.io/otel/semconv/v1.21.0`
+codes, user agents, and more. These attributes are available in the `go.opentelemetry.io/otel/semconv/v1.26.0`
 package.
 
 For details, see [Trace semantic conventions][].
@@ -364,7 +364,7 @@ import (
 	"go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
 	"go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/resource"
-	semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 func main() {
@@ -753,7 +753,7 @@ import (
 	"net/http"
 
 	"go.opentelemetry.io/otel/metric"
-	semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 func init() {
@@ -769,7 +769,7 @@ func init() {
 		// do some work in an API call and set the response HTTP status code
 
 		apiCounter.Add(r.Context(), 1,
-			metric.WithAttributes(semconv.HTTPStatusCode(statusCode)))
+			metric.WithAttributes(semconv.HTTPResponseStatusCode(statusCode)))
 	})
 }
 ```
@@ -1001,7 +1001,7 @@ import (
 	"go.opentelemetry.io/otel/log/global"
 	"go.opentelemetry.io/otel/sdk/log"
 	"go.opentelemetry.io/otel/sdk/resource"
-	semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 func main() {