man: Added description for type `dbox' to doveadm-dump.1
man: Added description for type `dbox' to doveadm-dump.1

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot