Manpages of postgresql18-server

• initdb(1pg18)
• pg_controldata(1pg18)
• pg_createsubscriber(1pg18)
• pg_ctl(1pg18)
• pg_resetwal(1pg18)
• pg_upgrade(1pg18)
• pg_waldump(1pg18)
• pg_walsummary(1pg18)
• postgres(1pg18)