📖 Update CAPV compatibility specification

[zhanggbj]

What this PR does / why we need it:
This section is out of date, so update it in case others may refer to it.

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 #1947

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

Update CAPV compatibility specification

[k8s-ci-robot]

Hi @zhanggbj. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

@zhanggbj: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/ok-to-test

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[sbueringer]

/ok-to-test

[zhanggbj]

This is ready for a review. Thx.

Also CC @yastij @sbueringer

[randomvariable]

/lgtm
/approve

[k8s-ci-robot]

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