Revise "The INFO command on a replica" (stage 45 - #hc6)

[TropicolX]

Note

Clarifies stage instructions to return role:master or role:slave in INFO replication based on --replicaof, with refined examples and test wording.

• Docs (stage_descriptions/replication-03-hc6.md):
  • Emphasize updating INFO replication to return role:master or role:slave depending on --replicaof.
  • Update heading capitalization for the --replicaof flag and streamline example usage.
  • Clarify tester behavior: runs INFO replication and expects a bulk string with role: slave.
  • Minor wording/formatting tweaks for clarity (e.g., key-value format, command casing).

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