chore: update metrics example with_service_name

Author: pitoniak32

examples/metrics-advanced/src/main.rs

@@ -50,7 +50,7 @@ fn init_meter_provider() -> opentelemetry_sdk::metrics::SdkMeterProvider {
         .build();
 
     let resource = Resource::builder()
-        .with_attribute(KeyValue::new("service.name", "metrics-advanced-example"))
+        .with_service_name("metrics-advanced-example")
         .build();
 
     let reader = PeriodicReader::builder(exporter, runtime::Tokio).build();