fix snytax

Author: Mafyuh

docker/grafana/docker-compose.yml

@@ -176,13 +176,13 @@ services:
       - grafana
 
   blackbox-exporter:
-        command: --config.file=/config/blackbox.yml
-        image: quay.io/prometheus/blackbox-exporter:v0.25.0
-        volumes:
-            - /docker/appdata/blackbox/config:/config
-        container_name: blackbox_exporter
-        ports:
-            - 9115:9115
+    command: --config.file=/config/blackbox.yml
+    container_name: blackbox-exporter
+    image: quay.io/prometheus/blackbox-exporter:v0.25.0
+    volumes:
+      - /docker/appdata/blackbox/config:/config
+    ports:
+      - 9115:9115
 
 networks:
   grafana: