<doc>[docs]: add func spec

[ZStack-Robot]

Resolves: ZSTAC-2668

Change-Id: I6a6c72686772666b6877656d736d6d7472706273

sync from gitlab !10624

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📥 Commits

Reviewing files that changed from the base of the PR and between 4a60698 and 5762e92.

📒 Files selected for processing (1)

• docs/design/SUG-2668-policy-rule-scheduler.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/pengchao.liu/draft-5.5.38-policy-rule-scheduler

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