- fix various internal links, directive and module references

- add missing documents to the sitemap (if it's not in the sitemap, it's not
  going into any of the offline formats)
- fix a few metafile references (d'oh)
- fix some typos along the way


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1562300 13f79535-47bb-0310-9956-ffa450edef68