Add documentation how to purchase Duo Pro
What does this MR do and why?
Adds documentation how to purchase Duo Pro additional seats
Related to https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/7634
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
Edited by Diana Zubova