Add missing apiVersion in the referencegrant API docs

[spacewander]

"apiVersion" is existing in other yaml examples under api-types/.
Signed-off-by: spacewander spacewanderlzx@gmail.com

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Fix the example of ReferenceGrant

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @spacewander. Thanks for your PR.

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[robscott]

Thanks @spacewander!

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, spacewander

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