docs: fix code block

Author: polikasov

readme.md

@@ -219,11 +219,11 @@ DENODE_PASSWORD='your password'
 ```
 
 Run the following commands to enable startup and run node
-    ```shell
-    sudo systemctl daemon-reload
-    sudo systemctl enable denode.service
-    sudo systemctl start denode.service
-    ```
+```shell
+sudo systemctl daemon-reload
+sudo systemctl enable denode.service
+sudo systemctl start denode.service
+```
 Now your node will be running and start at boot.
 
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