chore(docs): update opentelemetry docs (#70271)

### What?


https://nextjs.org/docs/app/building-your-application/optimizing/open-telemetry
is partially outdated.

### Why?

- As mentioned
[here](https://github.com/open-telemetry/opentelemetry-js/blob/cdfefb829441f0c2765756d61078c39531c04d05/semantic-conventions/src/resource/SemanticResourceAttributes.ts#L649-L656),
SEMRESATTRS_SERVICE_NAME has been deprecated.
- Also, the default ESLint configuration generated by create-next-app
triggers warnings about the import order.

### How?

- so it has been changed to ATTR_SERVICE_NAME.
- Also, fixed the import order.

Co-authored-by: JJ Kasper <jj@jjsweb.site>

docs/02-app/01-building-your-application/06-optimizing/10-open-telemetry.mdx

@@ -113,31 +113,31 @@ export async function register() {
 ```
 
 ```ts filename="instrumentation.node.ts" switcher
-import { NodeSDK } from '@opentelemetry/sdk-node'
 import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http'
 import { Resource } from '@opentelemetry/resources'
-import { SEMRESATTRS_SERVICE_NAME } from '@opentelemetry/semantic-conventions'
+import { NodeSDK } from '@opentelemetry/sdk-node'
 import { SimpleSpanProcessor } from '@opentelemetry/sdk-trace-node'
+import { ATTR_SERVICE_NAME } from '@opentelemetry/semantic-conventions'
 
 const sdk = new NodeSDK({
   resource: new Resource({
-    [SEMRESATTRS_SERVICE_NAME]: 'next-app',
+    [ATTR_SERVICE_NAME]: 'next-app',
   }),
   spanProcessor: new SimpleSpanProcessor(new OTLPTraceExporter()),
 })
 sdk.start()
 ```
 
 ```js filename="instrumentation.node.js" switcher
-import { NodeSDK } from '@opentelemetry/sdk-node'
 import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http'
 import { Resource } from '@opentelemetry/resources'
-import { SEMRESATTRS_SERVICE_NAME } from '@opentelemetry/semantic-conventions'
+import { NodeSDK } from '@opentelemetry/sdk-node'
 import { SimpleSpanProcessor } from '@opentelemetry/sdk-trace-node'
+import { ATTR_SERVICE_NAME } from '@opentelemetry/semantic-conventions'
 
 const sdk = new NodeSDK({
   resource: new Resource({
-    [SEMRESATTRS_SERVICE_NAME]: 'next-app',
+    [ATTR_SERVICE_NAME]: 'next-app',
   }),
   spanProcessor: new SimpleSpanProcessor(new OTLPTraceExporter()),
 })