fix yamllint offences

Author: Tomasz Tarczynski

CustomResourceDefinition/custom-resource-definition.yaml

@@ -1,3 +1,4 @@
+---
 # https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/#create-a-customresourcedefinition
 apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
@@ -38,4 +39,4 @@ spec:
     kind: CronTab
     # shortNames allow shorter string to match your resource on the CLI
     shortNames:
-    - ct
+      - ct