1) The instruction to create /var/db/openldap-data is no longer necessary, it is created at package installation. pkg query '%D' openldap-server /var/run/openldap /var/db/openldap-data /usr/local/libexec/openldap /usr/local/etc/openldap/schema 2) The instruction to copy /usr/local/etc/openldap/DB_CONFIG.example is wrong. No such file is installed (confirmed with pkg query '%Fp' openldap-server). I do not know what should be done here. ports/UPDATING and commit logs show substantial configuration changes including to the database setup. I have no idea what else may be out of date...
The LDAP chapter recently received an update in https://svnweb.freebsd.org/doc?view=revision&revision=52704, which should fix all the mentioned problems. If there is still something missing, please file a new problem report. Thanks!