improve instructions for disabling VisibilityOnDemand feature

[dgrove-oss]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Improves instructions for disabling VisibilityOnDemand feature.

Which issue(s) this PR fixes:

Fixes #3943.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[kannon92]

/lgtm

/assign @tenzen-y

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 25d95d1521506691aebc503a1befb46c4ece6c47

[mimowo]

/approve
/cherry-pick website

[k8s-infra-cherrypick-robot]

@mimowo: once the present PR merges, I will cherry-pick it on top of website in a new PR and assign it to you.

In response to this:

/approve
/cherry-pick website

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dgrove-oss, mimowo

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Needs approval from an approver in each of these files:

• site/OWNERS [mimowo]

Approvers can indicate their approval by writing /approve in a comment
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[k8s-infra-cherrypick-robot]

@mimowo: new pull request created: #3962

In response to this:

/approve
/cherry-pick website

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.