mod_autoindex: AddDescription directives for directories

now work as in Apache 1.3, where no trailing '/' is
specified on the directory name.  Previously, the trailing
'/' *had* to be specified, which was incompatible with
Apache 1.3.

PR:       7990


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97590 13f79535-47bb-0310-9956-ffa450edef68