kubectl explain doesn't work as expected

[sleungcy]

The problem is that kubectl explain doesn't work as expected on either of the controllers.

• Argo Events version: 1.9.4
• Argo Workflows version: 3.5.14

Describe the bug
When I run k explain on the resources of either Argo Events or Argo Workflows, I get no description as shown above.

$ k explain sensor.spec
GROUP:      argoproj.io
KIND:       Sensor
VERSION:    v1alpha1

FIELD: spec <Object>

DESCRIPTION:
    <empty>

To Reproduce
Steps to reproduce the behavior:

1. install argo-events 1.9.4+
2. run k explain sensor.spec

Expected behavior
The expected behavior is that the kubectl explain command would print out the documentation specific to the version of Argo Events/Argo Workflows I have.

Environment (please complete the following information):

• Argo Events: v1.9.4

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