Correct broken link #1645

[maheshcodes12]

Related issue

Closes #1645

Proposed Changes

The link was previously targeting non-existing url:

https://kyverno.io/docs/policy-types/cluster-policy/cleanup.md (404 / internal error)

The correct destination is the Cleanup Policy page:

https://kyverno.io/docs/policy-types/cleanup-policy/

Checklist

• [x] I have read the contributing guidelines.
• [x] I have inspected the website preview for accuracy.
• [x] I have signed off my issue.