Revise "Single-replica propagation #zn8" (stage 53)

[TropicolX]

Updated command propagation section for clarity and consistency. Revised descriptions of write commands and their propagation process.

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Note

Clarifies replication docs for write-command propagation over the replication connection, streamlines the tests section, and tightens notes/wording.

• Docs (replication-11-zn8.md):
  • Command Propagation: Clarifies that only write commands (e.g., SET, DEL) are propagated; non-write commands (e.g., PING, ECHO) are not.
  • Propagation Process: Refines explanation that commands are sent as RESP arrays over the same replication connection; replicas process without responding; mentions REPLCONF GETACK as the exception.
  • Tests: Replaces step-by-step handshake list with a concise reference to the full handshake; specifies verification that write commands are received in order, as RESP arrays, on the replication connection.
  • Notes: Tightens wording and formatting; emphasizes use of the replica-initiated TCP connection and buffering assumption.

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