docs: add securityGroupResourceGroup cloud config value

[aslafy-z]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Add securityGroupResourceGroup cloud config value in the documentation.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Release note:

docs: add 'securityGroupResourceGroup' cloud-config value

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @aslafy-z. Thanks for your PR.

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[nilo19]

/lgtm
/approve

Thank you very much.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aslafy-z, nilo19

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