Fixing 404 link error in release notes 1.15

[savitharaghunathan]

Pull request kubernetes/kubernetes#75622 was created by https://github.com/anyasabo. Updating 404 not found error with the right link in the release notes page of v1.15. (https://kubernetes.io/docs/setup/release/notes/)

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[savitharaghunathan]

/assign @makoscafee

[makoscafee]

/lgtm
/approve

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