Backport:

  Intergrate Kess' configure docs in the docs tree and,
  in particular, integrate them into install.xml by removing
  large chunks of that document and making it a summary
  with pointers into configure.xml.

  (I also snuck in the odd fix to both install.xml and
  configure.xml.  Sorry for the mix.)

  (Including subsequent typo fix.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@103158 13f79535-47bb-0310-9956-ffa450edef68