Fix example of kubectl config set-credentials command

[int128]

What type of PR is this?
/kind bug

What this PR does / why we need it:
This fixes the example of kubectl config set-credentials command.
Currently the API version is wrong and it will cause an error when running kubectl after configuration.

Which issue(s) this PR fixes:
None.

Special notes for your reviewer:
None.

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[k8s-ci-robot]

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[neolit123]

/lgtm
/ok-to-test
/priority backlog

[int128]

/retest

[soltysh]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: int128, soltysh

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