📖 [release-1.8] docs: fix broken ova link

[chrischdi]

What this PR does / why we need it:

Fixes broken ova link since removing ova templates from the old location.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[chrischdi]

/cherry-pick release-1.7

[k8s-infra-cherrypick-robot]

@chrischdi: once the present PR merges, I will cherry-pick it on top of release-1.7 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.7

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[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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• OWNERS [sbueringer]

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 17b980279c23698fdcb875db14c2be8506462360

[k8s-infra-cherrypick-robot]

@chrischdi: new pull request created: #3031

In response to this:

/cherry-pick release-1.7

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.