[doc] Add previously undocumented options in Terraform/Openstack

[zonca]

These options are available in https://github.com/zonca/jetstream_kubespray/blob/6ba36564107c34a6261f2ae44d05aa344277e10e/contrib/terraform/openstack/modules/compute/variables.tf#L204-L218 but are currently undocumented in the README.md

/kind documentation

Does this PR introduce a user-facing change?:
No

NONE

[k8s-ci-robot]

Hi @zonca. Thanks for your PR.

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[VannTen]

/ok-to-test

[zonca]

@VannTen this is only a fix on the documentation, should be quick to review.

[yankay]

Thanks @zonca
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yankay, zonca

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