Documentation patch #4 (ITS#1749)

Documentation patch #4  (ITS#1749)

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Written by Hallvard B. Furuseth and placed into the public domain.
This software is not subject to any license of the University of Oslo.
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Small changes:
- Fix typo slapd_meta -> slapd-meta in slapd-meta(5).
- Add slapd-dnssrv(5) to SEE ALSO in slapd.conf(5).
- Add descriptions of the files in FILES sections.
- Add $HOME/.udrc to FILES in ud(1) and ud.conf(5).
- Add ldaprc (without ".") and ENVIRONMENT VARIABLES in ldap.conf(5).
- Change manpage references to proper ".BR name (section)".

Hallvard B. Furuseth <h.b.furuseth@usit.uio.no>, May 2002.