Fix broken link

[ratailor]

This change fixes external broken link in doc, tests and minor nit in README.md file.

Assisted-by: claude-4-sonnet

[ratailor]

/retest

[stuggi]

@ratailor there are some higher prio PRs waiting to land. ci is flaky right now. lets get them in before this change.

[abays]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abays, ratailor

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[openshift-merge-robot]

PR needs rebase.

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[openshift-ci]

@ratailor: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/openstack-operator-build-deploy-kuttl-4-18	3cdd269	link	unknown	/test openstack-operator-build-deploy-kuttl-4-18
ci/prow/openstack-operator-build-deploy-kuttl	3cdd269	link	unknown	/test openstack-operator-build-deploy-kuttl

Full PR test history. Your PR dashboard.

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