Revise "Multi-replica propagation #hd5" (stage 54)

[TropicolX]

Clarify command propagation and testing process for replicas.

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Note

Refines replication-12-hd5 docs with a propagation recap and streamlined test description emphasizing multi-replica handshake, RDB, and ordered command forwarding.

• Docs:
  • stage_descriptions/replication-12-hd5.md:
    • Add “Command Propagation (Recap)” explaining forwarding all master writes to all replicas post-handshake/RDB.
    • Simplify tests section: describe multiple replicas completing handshake, receiving RDB, then verifying ordered SET propagation, replacing step-by-step command list.

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