Update MV documentation to remove references to 6-hour cooldown

[ConnorJC3]

What type of PR is this?

/kind documentation

What is this PR about? / Why do we need it?

Update docs to remove references to 6-hour cooldown and use evergreen wording instead.

How was this change tested?

N/A

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[github-actions]

Code Coverage Diff

This PR does not change the code coverage

[ElijahQuinones]

/lgtm
/approve

[mdzraf]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ElijahQuinones, mdzraf

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