misc cleanups in admin guide ldap sections

misc cleanups in admin guide ldap sections

There are a bunch of instances of incorrect punctuation, inconsistent
use of @-commands with option names, typos in names of principal
flags, and a couple spelling errors.  I only fixed what I noticed; I
haven't subjected the rest to careful review.

Also, the long section names for eDirectory-specific documentation
cause the tar files generated for snapshots (which include generated
html docs) to reach the 100-character limit for file names in
traditional tar format; GNU tar can create archives holding them, but
older tar implementations cannot read the archives properly.  So,
several eDirectory-related section names have been shortened.

ticket: new
target: 1.6
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19001 dc483132-0cff-0310-8789-dd5450dbe970