doc dtd changes:

- <module> elements can be flagged with outdated="true" now. This can be used
  for markup describing modules which no longer exist. (They won't generate
  invalid links)
- <directive> elements grew a "name" attribute, which can be set to the
  directive name if the element content is not the actual directive name. (for
  sections there's still the type='section' attribute).



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1561566 13f79535-47bb-0310-9956-ffa450edef68