Revise "Receive handshake (1/2) #fj0" (stage 50)

[TropicolX]

Updated the description of the handshake process for clarity and consistency. Adjusted the format and details of the commands received by the master.

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Note

Clarifies the master-side replication handshake docs with a concise step list and updated test command expectations.

• Documentation:
  • Handshake (Recap):
    • Reframes content from the master's perspective and renames section to Handshake (Recap).
    • Clarifies steps as a numbered list: PING, two REPLCONF, then PSYNC; notes PING needs no changes.
    • Specifies responding +OK\r\n to both REPLCONF commands; adds reference to RESP simple strings.
  • Tests:
    • Rewords and formats the command sequence and expected responses (PING, REPLCONF listening-port, REPLCONF capa psync2).

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