cli.md: picodata run --peer defaults to --advertise

Summary

• cli.md: picodata run --peer defaults to --advertise

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• Close #316 (closed)
• Follow-up for picodata!1198 (merged)
• See also picodata#680 (closed)
• Cherry-pick to: none
• Staging: https://docs.binary.picodata.io/picodata/kbezuglyi_update_peer_default_value/reference/cli/#run_peer