gitlab_runner: Update example

roles/gitlab_runner/README.md

@@ -31,8 +31,16 @@ gitlabrunner_extra_paths:
   - "{{ gitlabrunner_install_location }}/hetzner_machine"
 
 gitlabrunner_runners:
+    # The URL of the instance that this runner should be associated with
+  - gitlab_url: https://gitlab.example.com
+
+    # The token that you received when registering the runner (not the register token!!!)
+    # Register a runner first to obtain a token: https://docs.gitlab.com/runner/register/index.html#docker
+    # Can be done via the API and the registration token: eg. `curl --request POST "https://gitlab.example.com/api/v4/runners" --form "token=<registration_token>"`
+    gitlab_token:
+    
     # Adjust the name of the runner
-  - name: "hetzner-docker-auto-scale"
+    name: "hetzner-docker-auto-scale"
 
     # Set the docker executor
     executor: "docker+machine"