Add api document for group approval rule post endpoint
What does this MR do and why?
Add api document for group approval rule post endpoint. Relies on !137894 (merged).
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 #428051 (closed)
Edited by Gavin Hinfey