Add info to enable docker service

Author: jcubic

content/manuals/engine/install/fedora.md

@@ -190,8 +190,13 @@ download a new file each time you want to upgrade Docker Engine.
    ```console
    $ sudo systemctl start docker
    ```
+4. Make Docker start automatically after reboot.
 
-4. Verify that the Docker Engine installation is successful by running the
+   ```console
+   $ sudo systemctl enable docker
+   ```
+
+5. Verify that the Docker Engine installation is successful by running the
    `hello-world` image.
 
    ```console
@@ -201,6 +206,8 @@ download a new file each time you want to upgrade Docker Engine.
    This command downloads a test image and runs it in a container. When the
    container runs, it prints a confirmation message and exits.
 
+
+
 You have now successfully installed and started Docker Engine.
 
 {{< include "root-errors.md" >}}