Fix doc structure

Author: cristianrgreco

docs/supported-container-runtimes.md

@@ -35,11 +35,11 @@ export TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE=/var/run/docker.sock
 
 2. Export the `DOCKER_HOST`:
 
-   ```bash
-   {% raw %}
-   export DOCKER_HOST="unix://$(podman info --format '{{.Host.RemoteSocket.Path}}')"
-   {% endraw %}
-   ```
+    ```bash
+    {% raw %}
+    export DOCKER_HOST="unix://$(podman info --format '{{.Host.RemoteSocket.Path}}')"
+    {% endraw %}
+    ```
 
 ### Known issues