fixed invalid yaml in the docker compose (#20984)

The docker compose yaml wasn't formatted correctly.

Author: bdmorin

content/en/network_monitoring/performance/setup.md

@@ -407,29 +407,28 @@ If using `docker-compose`, make the following additions to the Datadog Agent ser
 ```
 version: '3'
 services:
-  ..
   datadog:
     image: "gcr.io/datadoghq/agent:latest"
     environment:
-       DD_SYSTEM_PROBE_NETWORK_ENABLED=true
-       DD_PROCESS_AGENT_ENABLED=true
-       DD_API_KEY=<DATADOG_API_KEY>
+      - DD_SYSTEM_PROBE_NETWORK_ENABLED=true
+      - DD_PROCESS_AGENT_ENABLED=true
+      - DD_API_KEY=<DATADOG_API_KEY>
     volumes:
-    - /var/run/docker.sock:/var/run/docker.sock:ro
-    - /proc/:/host/proc/:ro
-    - /sys/fs/cgroup/:/host/sys/fs/cgroup:ro
-    - /sys/kernel/debug:/sys/kernel/debug
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - /proc/:/host/proc/:ro
+      - /sys/fs/cgroup/:/host/sys/fs/cgroup:ro
+      - /sys/kernel/debug:/sys/kernel/debug
     cap_add:
-    - SYS_ADMIN
-    - SYS_RESOURCE
-    - SYS_PTRACE
-    - NET_ADMIN
-    - NET_BROADCAST
-    - NET_RAW
-    - IPC_LOCK
-    - CHOWN
+      - SYS_ADMIN
+      - SYS_RESOURCE
+      - SYS_PTRACE
+      - NET_ADMIN
+      - NET_BROADCAST
+      - NET_RAW
+      - IPC_LOCK
+      - CHOWN
     security_opt:
-    - apparmor:unconfined
+      - apparmor:unconfined
 ```
 
 [1]: https://app.datadoghq.com/organization-settings/api-keys