Update README.md to fix several doc links for OpenStack and vSphere

[bizhao]

Fix 3 broken links. Two of them are because of https://github.com/kubernetes-sigs/kubespray/pull/11633

/kind bug /kind documentation

What this PR does / why we need it: Fix three broken links in the README.md file.

Which issue(s) this PR fixes: Fixes #11735

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

Hi @bizhao. Thanks for your PR.

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[ErikJiang]

/ok-to-test

[ErikJiang]

@bizhao 🤝 thanks ~

/lgtm

[bizhao]

/retest

[VannTen]

/approve /retest-failed

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bizhao, VannTen

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