Update docker-compose structure in deploying.md

adding "services:" top-level key in docker-compose file example.

Signed-off-by: John de Graaff <john@de-graaff.net>

docs/content/about/deploying.md

@@ -496,21 +496,22 @@ compose file to deploy it, rather than relying on a specific `docker run`
 invocation. Use the following example `docker-compose.yml` as a template.
 
 ```yaml
-registry:
-  restart: always
-  image: registry:3
-  ports:
-    - 5000:5000
-  environment:
-    REGISTRY_HTTP_TLS_CERTIFICATE: /certs/domain.crt
-    REGISTRY_HTTP_TLS_KEY: /certs/domain.key
-    REGISTRY_AUTH: htpasswd
-    REGISTRY_AUTH_HTPASSWD_PATH: /auth/htpasswd
-    REGISTRY_AUTH_HTPASSWD_REALM: Registry Realm
-  volumes:
-    - /path/data:/var/lib/registry
-    - /path/certs:/certs
-    - /path/auth:/auth
+services:
+  registry:
+    restart: always
+    image: registry:3
+    ports:
+      - 5000:5000
+    environment:
+      REGISTRY_HTTP_TLS_CERTIFICATE: /certs/domain.crt
+      REGISTRY_HTTP_TLS_KEY: /certs/domain.key
+      REGISTRY_AUTH: htpasswd
+      REGISTRY_AUTH_HTPASSWD_PATH: /auth/htpasswd
+      REGISTRY_AUTH_HTPASSWD_REALM: Registry Realm
+    volumes:
+      - /path/data:/var/lib/registry
+      - /path/certs:/certs
+      - /path/auth:/auth
 ```
 
 {{< hint type=warning >}}