Fix docker-compose syntax in quick-start. GH containrrr#1105

docs/index.md

@@ -45,18 +45,21 @@ and restart it with the same options that were used when it was deployed initial
 the following command:
 
 === "docker run"
-    ```bash
-    $ docker run -d \
-    --name watchtower \
-    -v /var/run/docker.sock:/var/run/docker.sock \
-    containrrr/watchtower
-    ```
+
+  ```bash
+  $ docker run -d \
+  --name watchtower \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  containrrr/watchtower
+  ```
+
 === "docker-compose.yml"
-    ```yaml
-    version: "3"
-    services:
-      watchtower:
-        image: containrrr/watchtower
-        volumes:
-          - /var/run/docker.sock:/var/run/docker.sock
-    ```
+
+  ```yaml
+  version: "3"
+  services:
+    watchtower:
+      image: containrrr/watchtower
+      volumes:
+        - /var/run/docker.sock:/var/run/docker.sock
+  ```