Make a direct link to the index of directives in the docs,

since that is really the place to start when working through
the config file.

Remove the concept of "sections" in the config file.  They were
not that helpful anymore.

Fix a broken reference to extra/httpd-multilang-errordocs.conf.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/simple-conf@160098 13f79535-47bb-0310-9956-ffa450edef68