Add documentation for unlinking security policy project
What does this MR do and why?
We're adding information about unlinking security policy project.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #344881 (closed)
Edited by Alan (Maciej) Paruszewski