* Fix typo: 'on' vs. 'or'

* Fix versioning information where it makes sense
* Clarify DNS lookups: 'double reverse lookup' vs. 'two lookups'

Submitted, in parts, by <lucien.gentis lorraine.iufm.fr>.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@587442 13f79535-47bb-0310-9956-ffa450edef68