Briefly compare back-bdb and back-ldbm.
Remove mention of MDBM and NDBM.  Rename GNU DBM to GDBM.
Fix spacing typos.  Prefix an octal file mode with 0.
Mention "notags" (new name for "nolang" from the attribute options patch).
Add SEE ALSO slapd-monitor(5) to slapd.conf(5).