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In the "Red Hat Enterprise Linux 6 Deployment Guide", edition 1 (PDF version) in section 17.2.5.2 Log In Options and Access Controls (p.362) there is a bullet item list of directives to configure vsftpd.
Between directives "pam_service_name" and "userlist_deny", there is a bullet item that only says what the default value is, but not for which directive. This is different from the surrounding directives' descriptions and most likely an omission of text.