fix: Update docker-compose.yml path for examples/llm/benchmarks (ai-dynamo#1816)

Author: kthui

examples/llm/benchmarks/README.md

@@ -43,7 +43,7 @@ This guide provides detailed steps on benchmarking Large Language Models (LLMs)
  3. Start NATS and ETCD
 
     ```bash
-    docker compose -f deploy/docker_compose.yml up -d
+    docker compose -f deploy/metrics/docker-compose.yml up -d
     ```
 
 > [!NOTE]