Fix CustomResourceDefinition manifest yaml in custom_object.py example

[Priyankasaggu11929]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

This PR fixes the CustomResourceDefinition yaml manifest mentioned in the custom_object.py example.

The correct manifest would be the following (which adds the required schema section, spec.versions[0].schema.openAPIV3Schema)

Reference: https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/_print/#create-a-customresourcedefinition

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: crontabs.stable.example.com
spec:
  group: stable.example.com
  versions:
    - name: v1
      served: true
      storage: true
      schema:
        openAPIV3Schema:
          type: object
          properties:
            spec:
              type: object
              properties:
                cronSpec:
                  type: string
                image:
                  type: string
                replicas:
                  type: integer
  scope: Namespaced
  names:
    plural: crontabs
    singular: crontab
    kind: CronTab
    shortNames:
    - ct

Which issue(s) this PR fixes:

Fixes #1432

Does this PR introduce a user-facing change?

NONE

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[yliaog]

/lgtm
/approve

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This pull-request has been approved by: Priyankasaggu11929, yliaog

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